Network speed seems extremely wild

Hello, all.
I am using fiber optic 20M connection, ethernet (not Wi-Fi), Mac mini Mid 2012, 16GB RAM, Apple SSD. Also MBP 15-inch 2010, OS 10.6.8, 4GB RAM. I moved to this home three weeks ago. For two weeks, it was normal. the past 4-5 days, all Internet traffic seems to be running through peanut butter. My connection seems wildly varying. I ran a test three times at http://www.speedtest.net with normal results twice (21-22M download, 2.5 upload) and "Test Timeout" once. Using Network Utility for ping, I get these results (each starts at >>>)....
>>>For developer.apple.com
“ping: cannot resolve developer.apple.com: Unknown host”
>>>For apple.com
“Ping has started…
PING apple.com (17.142.160.59): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
Request timeout for icmp_seq 6
Request timeout for icmp_seq 7
Request timeout for icmp_seq 8
--- apple.com ping statistics ---
10 packets transmitted, 0 packets received, 100.0% packet loss”
>>>For yahoo.com
“Ping has started…
PING yahoo.com (206.190.36.45): 56 data bytes
64 bytes from 206.190.36.45: icmp_seq=0 ttl=47 time=367.153 ms
64 bytes from 206.190.36.45: icmp_seq=1 ttl=47 time=367.187 ms
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
Request timeout for icmp_seq 6
Request timeout for icmp_seq 7
Request timeout for icmp_seq 8
64 bytes from 206.190.36.45: icmp_seq=9 ttl=47 time=368.304 ms
--- yahoo.com ping statistics ---
10 packets transmitted, 3 packets received, 70.0% packet loss
round-trip min/avg/max/stddev = 367.153/367.548/368.304/0.535 ms”
>>>For answers.yahoo.com
“Ping has started…
PING tw1-ycpi-uno.gycpi.b.yahoodns.net (203.84.197.9): 56 data bytes
64 bytes from 203.84.197.9: icmp_seq=0 ttl=49 time=38.400 ms
64 bytes from 203.84.197.9: icmp_seq=1 ttl=49 time=36.719 ms
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
Request timeout for icmp_seq 6
Request timeout for icmp_seq 7
Request timeout for icmp_seq 8
64 bytes from 203.84.197.9: icmp_seq=9 ttl=49 time=37.723 ms
--- tw1-ycpi-uno.gycpi.b.yahoodns.net ping statistics ---
10 packets transmitted, 3 packets received, 70.0% packet loss
round-trip min/avg/max/stddev = 36.719/37.614/38.400/0.691 ms
>>>For speedtest.net
“Ping has started…
ping: cannot resolve speedtest.net: Unknown host”
>>>Repeating for speedtest.net
“Ping has started…
PING speedtest.net (216.146.46.11): 56 data bytes
64 bytes from 216.146.46.11: icmp_seq=0 ttl=52 time=192.591 ms
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
64 bytes from 216.146.46.11: icmp_seq=5 ttl=52 time=221.062 ms
64 bytes from 216.146.46.11: icmp_seq=6 ttl=52 time=217.418 ms
Request timeout for icmp_seq 7
64 bytes from 216.146.46.11: icmp_seq=8 ttl=52 time=208.772 ms
64 bytes from 216.146.46.11: icmp_seq=9 ttl=52 time=198.422 ms
--- speedtest.net ping statistics ---
10 packets transmitted, 5 packets received, 50.0% packet loss
round-trip min/avg/max/stddev = 192.591/207.653/221.062/10.849 ms
Things I've tried...
One minute power off of router (ISP's device, has no obvioushard reset).
Wi-Fi -- no improvement.
A different computer -- no improvement.
Safari / Firefox -- no improvement.
Resetting browsers -- no improvement.
Disk Utility > Verify Disk -- "volume appears to be OK"
The Mac mini startup disk has 35.7% available space.
Any suggestions?

Edit above message:
After talking to Sprint tech support, they stated to remove the battery for one minute, replace it and see what happens. After doing so, all works well now and my free memory rose by 8mb. Apparently, from time to time,it is a good idea to do this, especially if things seem s-l-o-w and nothing else on the phone has changed.
Hope this helps others.

Similar Messages

Network speed seems slow

Have Pearl 8130 (ver 4.5) for a month now and with no additional downloading(d/l) of files, ringers, etc. from original configuration. The first couple of weeks, signal and Internet requests were strong and fairly quick. Now from the same location(s) the signal is still strong, but the Internet homepage 'requesting speeds' seemed to have slowed down tremendously. 1XEV still shows on display screen. Sometimes, I "re-request" the request and this seems to help some. Is this slow down normal for the Sprint 3G network? Coverage maps show "good" for me. Any help or information appreciated.
Solved!
Go to Solution.

Edit above message:
After talking to Sprint tech support, they stated to remove the battery for one minute, replace it and see what happens. After doing so, all works well now and my free memory rose by 8mb. Apparently, from time to time,it is a good idea to do this, especially if things seem s-l-o-w and nothing else on the phone has changed.
Hope this helps others.

Network speed WAY down for internet - help??

I have 3 airport extreme's set up as a WDN. It all works great. Internet is fast through a cable modem attached to the main stations WAN port.
It seems though that when "certain" users are getting into heavy internet traffic, seemingly large continuous downloads, the REST of the network is slowing down. The internet slows down to a CRAWL, so much so that eventually safari brings up the "network troublshooting" thing.
What is perplexing about this is that when I try to remote desktop to another machine on the LAN, THIS TOO has slowed to a crawl! There are no other LAN transfers or interactions between machines going on, ONLY NAT/DHCP net access.
I KNOW it is other users, because when I disconnect the internet, the network speed instantly goes back to super fast, remote desktop works great etc, then it seems somebody is starting their download again (ha ha that I just disconnected) and suddenly it's crawling. This doesn't seem right, not with only 3 - 5 users on a 3 base station system, and a 1Mb/s internet cable connection.... does it? At least, if the internet is slowing down, other LAN traffic (non internet related) should not right?? This is the part that has got me confused.
Also is there any software out there that will let me see stats from the main station in regards to:
- DHCP LAN assignments
- and upload / download traffic of each of those LAN addresses and other information.
Thanks,
Miklos.
PS Just to be clear when the internet is extremely slow it is not one particular site - email doesn't work, and the same site, reloaded again and again does not load - the rest of the network is simultaneously slow - I disconnect the internet (log off via simple software app supplied by the ISP) and within 5 - 10 seconds, network speed is visibly up - things start loading properly, and the internet - the same site, starts to load very fast.
My dilemma is how can the internet usage slow the REST of the network, when it's a very fast system! Another point: I am NOT resetting the base stations, they are remaining online and nobody is getting bumped off, I'm only disconnecting the internet feed that's ALL, so it's not like they're getting kicked off and then network speed is resuming, they are still in effect logged on to the network, they just can't access the internet.

Did you run it in store? If so, the wireless instore is notoriously bogged down/slow with all the things connected to it.
If you like my post, or solution to your issue/question, go ahead and click on the little star by my name and/or accept the post as the Solution. It makes me happy.
I'm NOT an employee of Best Buy, or Geek Squad, though I did work as an Agent for a year 5 years ago. None of my posts are to be taken as the official stance that Best Buy will take on your situation. My advice is just that, advice.
Unfortunately, that's the bad luck of any electronic, there's going to be bad Apples... wait that's a horrible pun.

Extending network via airport extreme N non dual band and airport expresses

I have experimented with this a lot because I have 3 expresses and an extreme, one express is wired to my extreme in bridged G mode so my iphone can access my network of macs and the rest are running in N 2.4ghz joined to the extreme network as apposed to extending the network. It seemed to me that the 5ghz is much faster but has very poor range about half the range of the N so I run the network in 2.4ghz. Oddly the express I have bridged running in G mode seems to have more range than the N network. Whenever I tried to extend the network with an express in N 2.4ghz my performance went down and I could not really notice any difference in range. Perhaps this has changed with firmware updates of late so I am going to play with them some more. A side note is that when the express is in join mode to my extremes N 2.4 ghz network I can stream full HD video 1080i and 5.1 sound to my other macs. So when my MBP is hooked up to my AV
setup I can stream Eyetv recordings around the house. But when I extend the network the playback is choppy. It seems when you extend the data rate takes a dive. The odd thing to me is that it seems that the N network does not have any more range that the G express if not even a little less range. My extreme and bridged express are in the same place in my house and if I go outside on my deck there is no N and there is a little G and again if I extend the N network with an express it seems to make almost no difference in range and the transfer speeds seems to drop.
Any thoughts on how to improved N speed / range in extend mode would be appreciated.

The ethernet port is active with this settting, (assuming you enable it in AirPort Utility) which can be a plus in some installations, but I see no improvement in the "breadth" of the wireless network using the "Join" setting, at least when comparing it to the "extend" setting. Is this correct?
The AXn's feature to join a wireless network & have its Ethernet port enabled, as you already know, is known as ProxySTA.
Although a convenient feature indeed, it's not stellar as far as maximum bandwidth goes. As an example, the following would be typical "real life" throughput values (for the AXn's 2.4 GHz radio) based on the AXn's configuration:
o Router: Wired-to-wireless: 85 Mbps
o WDS: Wireless-to-wireless: 33-39 Mbps (Note: Extended would be closer to the Router value)
o ProxySTA: Wireless-to-wired: 26-35 Mbps
Unfortunately, ProxySTA is the "worst" of the bunch.
I have to believe that a lot of the confusion between "join" and "extend" is occurring because the "extend" option is not available in the auto setup using AirPort Utility. Aren't there a lot of users out there configured to "Join" when they think they are "extending"?
No doubt the "Manual Setup" function of the AirPort Utility still needs a bit of improvement as it does tend to confuse folks. Similar, would be the differences between "Extend" & a "WDS" as both are types of WDS.

Network speed affected by large file copy operations. Also, why intermittent network outages?

Hi
I have a couple of issues on our company network.
The first is thate a single large file copy imapcts the entire network and dramatically reduces network speed and the second is that there are periodic outages where file open/close/save operations may appear to hang, and also where programs that rely on
network connectivity e.g. email, appear to hang. It is as though the PC loses it's connection to the network, but the status of the network icon does not change. For the second issue if we wait the program will respond but the wait period can be up to 1min.
The downside of this is that this affects Access databases on our server so that when an 'outage' occurs the Access client cannot recover and hangs permamnently.
We have a Windows Active Directory domain that comprises Windows 2003 R2 (soon to be decommissioned), Windows Server 2008 Standard and Windows Server 2012 R2 Standard domain controllers. There are two member servers: A file server running Windows 2008 Storage
Server and a remote access server (which also runs WSUS) running Windows Server 2012 Standard. The clients comprise about 35 Win7 PC's and 1 Vista PC.
When I copy or move a large file from the 2008 Storage Server to my Win7 client other staff experience massive slowdowns when accessing the network. Recently I was moving several files from the Storage Server to my local drive. The files comprised pairs
(e.g. folo76t5.pmm and folo76t5.pmi), one of which is less than 1MB and the other varies between 1.5 - 1.9GB. I was moving two files at a time so the total file size for each operation was just under 2GB.
While the file move operation was taking place a colleague was trying to open a 36k Excel file. After waiting 3mins he asked me for help. I did some tests and noticed that when I was not copying large files he could open the Excel file immediately. When
I started copying more data from the Storage Server to my local drive it took several minutes before his PC could open the Excel file.
I also noticed on my Win7 client that our email client (Pegasus Mail), which was the only application I had open at the time would hang when the move operation was started and it would take at least a minute for it to start responding.
Ordinarlily we work with many files
Anyone have any suggestions, please? This is something that is affecting all clients. I can't carry out file maintenance on large files during normal work hours if network speed is going to be so badly impacted.
I'm still working on the intermittent network outages (the second issue), but if anyone has any suggestions about what may be causing this I would be grateful if you could share them.
Thanks

What have you checked for resource usage during one of these copies of a large file?
At a minimum I would check Task Manager>Resource Monitor. In particular check the disk and network usage. Also, look at RAM and CPU while the copy is taking place.
What RAID level is there on the file server?
There are many possible areas that could be causing your problem(s). And it could be more than one thing. Start by checking these things. And go from there.
Hi, JohnB352
Thanks for the suggestions. I have monitored the server and can see that the memory is nearly maxed out with a lot of hard faults (varies between several hundred to several thousand), recorded during normal usage. The Disk and CPU seem normal.
I'm going to replace the RAM and double it up to 12GB.
Thanks! This may help with some other issues we are having. I'll post back after it has been done.
[Edit]
Forgot to mention: there are 6 drives in the server. 2 for the OS (Mirrored RAID 1) and 4 for the data (Striped RAID 5).

Poor network speed with 1st generation time capsule and multiple airport express 5Ghz. My network speed slows to a crawl when not close to the time capsule. I get the range that I need, but the speed is painfully slow.

Hello,
I have a first generation time capsule running 802.11n (b/g compatable) and the airport expresse's are the newer 5ghz models. I have 3 airport express's and I have the range that I need. I can run the time capsule using 802.11n 5ghz, but I loose the range and can't connect to all of the airport express's. My computers and mobile devices run 802.11n. Does anyone have any suggestions on how to increase the network speed. Would the new airport extreme fix the problem?
Thank you

Unfortunately, you are experiencing one of the downsides to 5 GHz. That's because the higher frequency 5 GHz signals are much weaker than 2.4 GHz signals.
After all, you always have to give up something to gain something else. In the case of 5 GHz, you gain potential speed but in return, you must give up penetration power and distance capability.
In order to work well, 5 GHz signals need to almost have a line-of-sight relationship between devices. Unless you can achieve this, you will do much better to leave the Time Capsule running at the 802.11n (b/g compatible) 2.4 GHz Radio Mode and allow the Express devices to "extend" that network.
As for the location of the AirPort Express devices in an exended network, that is critical for best performance. That's because the Express can only "extend" the quality and bandwidth of the signal that it receives. Post back if you need a few more tips on how to find the best location for the AirPort Express devices.
Would the new airport extreme fix the problem?
Unfortunately, no.

I am desperate!! slow choppy network speeds (not actual inability to cnnct)

I have a 13" macbook air that has the following problem: I can connect to wifi networks (including at home WPA and also tried WPA2 settings) but even though I may get proper speed at first, I soon lose that and it becomes much slower and choppy (if I open activity monitor I can see the speed going up and down like crazy...). My internet speed at home is 12mpbs set by my provider. When I perform speed tests (vis speedtest.net or downloading files from other speed test sites) on my windows PC that is also on this network I get the full download speed. However with this MAC while I initially did get the full speed, it is now down to an average of 3-5mbps and the activity monitor, again, shows choppy behavior so it will be at 8 then at zero almost and then up and down again but never near the full speed. I tried to connect to other networks and I have the same problem - once this happens it stays. I tried removing the airport connection in network preferences and adding it again it does not help.
I TALKED TO APPLE AND HAD MY COMPUTER TESTED BY THEM - they didn't find any hardware issues (they said it was fine - but it isn't) but they still replaced the airport hardware in the computer - both the chip and the antenna (which meant replacing the entire screen). I brought the computer home, ran a speed test and everything was fine. I thought GREAT but then something happened and the problem returned. What I did (which I think was unrelated) was connect via SMB to a PC at home and I tried to stream a movie file. I noticed it kept 'pausing' so I opened up activity monitor again and to my HORROR I saw the choppy wave with network speed very inconsistent going up and down like crazy... I tried connecting to my slingox using the sling web access after disconnecting from my home PC but got partial speed and lots of drops too. I tried the speed test again multiple times, nothing seems to work.
SO I don't know what to do at this point. I have 10.6.6 running. I heard something about a firmware update but I am new to mac so not sure how to even do that or what else I can do to solve this problem or what is causing it. BTW - logging in now from the guest account still does not fix the issues and they remain the same.
I am desperately looking for help!!
Thanks a lot!

Have you been able to reproduce your problems on other wireless networks other than at your house? It appears you are saying that this occurs on all wireless, but I'm not sure from your comment. If it's only at home, it would appear to be a compatibility issue between your wireless access point and the Macbook Air, which isn't uncommon. Sometimes a firmware upgrade to the access point can fix it, sometimes it might require switching to a different brand of access point. It would be great if you could borrow (or buy and return) a different access point/router to test. An Apple airport would be the best to use of course. Not the easiest solution, but lets you help rule out a hardware issue with your air.
My isp provides 15mbps but my wireless devices such as my iphone, ipad, laptop usually only get 6.5-8 mbps when testing speeds to the internet. I don't expect it to be as good as the wired due to interference, signal, etc. I don't get the choppy behavior however. Firware updates from Apple will appear in the same manner as standard software updates. If there is one available for your system it should appear when you check for software updates. That being said, I believe you can also manually download them from the Apple site.

[SOLVED] Network speed very slow, no apparent reason

Hello, recently I switched from Windows 7 RC1 to Arch on my home machine (I have used Gentoo, Ubuntu, and Fedora 10 on the same machine in the past), and for some reason network speed is very slow.
I have Verizon's 20mbit/5mbit package, and I have always gotten that speed.
Using speedtest.net and 100mb.test from cachefly on multiple computers I have come to the conclusion that it is infact my Arch install that is causing the problem:
- All other machines on my network are getting 20/5 (both wired and wireless)
- I ran a speedtest from 2 other machines using the ethernet cable that this PC is on. Again, full 20/5.
- scp transfer of 100mb.test from this PC -> other Arch box: ~2.8MB/s.
- scp transfer of 100mb.test from other Arch box -> this PC: ~2.8MB/s.
- scp transfer of 100mb.test from this PC -> UK VPS (100mbit line): ~539KB/s
- scp transfer of 100mb.test from UK VPS -> this PC: ~76KB/s
- scp transfer of 100mb.test from this PC -> Chicago Server (dual gbit lines): ~563KB/s
- scp transfer of 100mb.test from Chicago Server -> this PC: ~91KB/s
speedtest.net result:
Upload speed seems to be unaffected.
I have tried disabling TCP window scaling, and appending my hostname to /etc/hosts.
What is weird though is that the other Arch box has an identical network config, I don't see any reason why it shouldn't work.
My NIC is an integrated Realtek something, I can get the exact model if needed.
Last edited by whipsch (2009-06-05 18:29:21)

Hi, whipsch
Can you try ethtool to see if your ethernet card is actually negociating and using a 100Mb full duplex link on your LAN ? If not you can try to force the link parameter with ethtool. Also maybe the driver of your NIc has options related to link negociation.
Hope this helps,
JF

I just got a Time Capsule, and when I try to use it to extend my Airport n type network, it seems to take it over instead.

Could I be doing something wrong to cause this? The Time Capsule is hanging off the network on an ethernet cable and can be accessed by all the Macs over wireless, but I would like to use it to strengthen the signal at that end of the house. When try to set it up the extend the network, It seems to take it over and knock off the Airport Extreme and Airport Express currently on it. When I initially set it up, I selected "Extend network" but it changed it on its own to create network. I later changed it back to extend, but it then took over and I had to turn off its wireless to get the Epress and Extreme back onto the network. I had just updated the Airport Utility to the latest version on my Macbook Pro and Mini, but I have an iMac still on Snow Leopard that I believe is still running an older version.

Actually I am not sure how much it is able to export of the old settings but worth a go.
The file is xml format .. so it could be possible to extract info anyway.
?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
You can always load 5.6 utility onto any version of the OS from Lion following.
How to load 5.6 into ML.
1. Download 5.6 for Lion.
http://support.apple.com/kb/DL1482
Click to open the dmg but do not attempt to install the pkg.. it won't work anyway.
Leave the package open on the desktop so you can see the file. AirportUtility56.pkg
2. Download and install unpkg.
http://www.timdoug.com/unpkg/
Run unpkg on the desktop.. If your Mac refuses to run the software, because it wasn’t downloaded from the Apple store, go to security in preferences and allow other software to work.. this is limitation of trade methinks. You can set back later if you like.
Now drag the AirPortUtility56.pkg file over to unpkg.. and it will create a new directory of the same name on the desktop.. in finder, open the new directory, drill down.. applications, utilities .. there lo and behold is Airport utility 5.6 .. drag it to your main utilities directory or just run it from current location.
You cannot uninstall version 6 (now 6.3 if you updated) so don't try.. and you cannot or should not run them both at the same time.. although I have had no problems when doing so.

Drop in network speed

Does anyone have a clue why my 5/11 MBP has a HUGE decrease in network speed when I connect to my older ACD + Logitech Wave wireless keyboard + external hard drive. I also use the same wireless keyboard and mouse and another firewire external HD *but a 2011 ACD* without any decrease in network speed.
Could attaching the older display be causing a problem? It never was with my 2009 MBP.
Jeff

Ah-ha! Snow Leopard Server is wonderful, but it's also a little bit nosy and a little too take-charge for its own good. The server had forced its local IP address into a position as one of the DNS servers, which it was not in a position to do. For whatever reason, this did not affect the secured network, but the guest network didn't like it. Actually, correction, on the main network, performance seems to have picked up!

Network speed test in jsp

I would like to know which APIs are necessary to develop a network speed tester in jsp or which method to do this, knowing about which APIs it's necessary, I will study them. Here is a example of a network speed tester that I'm trying to do
Examples:
http://www.coiinc.com/speedtest/initialmeter.php
http://www.pcativo.com.br/testes.asp?teste_tipo=velocidade
http://www.navegante.com.br/medidor/initialmeter.php
http://medidor.interair.com.br/
http://www.rjnet.com.br/velocimetro/index2.htm

Sir,
For at least a couple of these options it appears that the test is actually based on JavaScript.
What seems to happen is that at the beginning of the page there is a JavaScript variable that is set with the time.
Then there is a big amount of some sort of data. Which I would guess has been measured to be X big. Let's say 1 MB.
Finally there is another bit of Javascript which again takes the time and then finds out the difference and from that one can sort of conclude the time difference.
But I am not convinced this will always work perfectly but who knows... anyway your use of JSP wouldn't preclude you from just basically copying what these others are doing.
Sincerely,
Slappy

Network speed issues while using osx

this may seem a little bit strange, and i can't make any sense out of it but if anyone can figure out what my problem might be it would be greatly appreciated.
i have an older duel os (win xp, leopard) mbp and have had a lot of problems with hardware/software (osx) in the past, and have ended up, to my dismay, almost exclusively using windows.
anyway, just yesterday i decided it was time to give osx another chance. so besides having it hanging constantly while doing simple tasks, i have noticed my network speed is drastically reduced.
i ran a test on speedtest.net and ended up with 500kps average download speed, and 70kbps upload speed, with the closest server in my town at 800 ping.
i straight away restarded into windows and ran the test again, and achieved 13500kbps download, and 600kpbs upload, with a ping of 66.
NOTHING changed between the time of restarting. The router was left as it was, no other computers are switched on, and nothing is downloading.
In the past when using osx i have had frequent connection dropping issues, but as i run wireless i always just attributed it to my router. Although since using windows exclusively this has also ceased.
I have looked through airport settings and cannot find anything that looks like it may be the problem, although i'm not as experienced at getting into the back-end settings on osx.
the part that confuses me the most is the ping. latency generally increases with distance, not so much speed. i dont understand how the same server situated nearby can give 66 ms in windows and 800 in osx.
if anyone has any ideas, i thank you in advance.
p.s. i have osx 1.5.4 and was updating to 1.5.5 but the slow download speeds caused me to create this post. it does mention an increase in network performance in update notes for 1.5.5, if that will solve this than i apologize, although i doubt this drastic speed difference could have existed for so long if everything is set up correctly.

You are certainly not alone. I have the same problem. Download speed seems to be limited to 500KB/s (any program, any service) and 2.18MB/s using Windows. I tried two different routers with the same results. Even downloading the same files using rapidshare led to this. Very strange.
This has nothing to do with the DNS server. My connection speed is pretty fast. With and without the recommended OpenDNS server settings. I just re-installed Leopard and updated to 10.5.6. Nothing changed.
Seems like something is throttling the max. dl speed. Odd!

Network speed while a backup is happening with a TC?

1.) Using a N network with speeds supposedly up to 20mbps, what happens to the overall network speed when a first gen TC is backing up a Mac? Will it affect streaming Netflix? Playing Xbox Live? etc.?
2.) Where should I have the Cat6 cables connected to make sure it backs up as quickly as possible? Just from the Modem to the TC? I am also going to use an Extreme for a roaming network, so would I also need to have cat6 from the wall to the Extreme to make sure it is as fast as can be? Anywhere else?
Thanks!

1.) Using a N network with speeds supposedly up to 20mbps, what happens to the overall network speed when a first gen TC is backing up a Mac? Will it affect streaming Netflix? Playing Xbox Live? etc.?
Since backups and streaming must share the same overall bandwidth, there will be some loss of bandwidth to accomodate both happening simultaneously. Streaming from Netflix will NOT be affected from the ISP to the router, but may potentially be affected between the router and the Netflix host device. Same would hold true for the Xbox.
2.) Where should I have the Cat6 cables connected to make sure it backs up as quickly as possible? Just from the Modem to the TC?
First, you will only get Gigabit speeds if, as a minimum, the following are true: 1) All four pairs of wire within the cable are dedicated for data, 2) All ports have Gigabit interfaces, & 3) Ideally, all ports support Jumbo Frames.
Second, CAT-6 cabling is not required for Gigabit. CAT-5e is totally capable of handling the frequency rate for Gigabit. In fact, CAT-6 was designed to support up to 10 Gigabit networking. If; however, you can obtain CAT-6 at or near the same price point as CAT-5e, then there is nothing wrong with using CAT-6.
With that said, the 1st Gen TC does have Gigabit interfaces, but does support Jumbo Frames, so getting near Gigabit bandwidth will not be possible.
To provide the best bandwidth for backups, you will want a Gigabit Ethernet connection between the device being backed up to the TC.
I am also going to use an Extreme for a roaming network, so would I also need to have cat6 from the wall to the Extreme to make sure it is as fast as can be? Anywhere else?
You will want CAT-6 on the cable run in the wall between routers as well. You will also not want to share any of the four pairs of wires in these cables for other purposes, like phone service. It is common practice in newer house that come pre-wired to use Ethernet runs that terminate at a wall plate that provides both an Ethernet and phone jack. Typically, they will use the same cable and connect two of the pairs for Ethernet (the minimum required for 100 Mbps Ethernet) and connect one pair for phone service. Again, Gigabit Ethernet requires all four pairs to be dedicated to data.
(ref: SmallNetBuilder: Need To Know: Jumbo Frames in Small Networks)

Extending network with Airport Extreme and Airport Express

I am trying to extend my network from Aiport Extreme via Aiport Express. The problem is that I do not wan to use WDC (speed penalty). Is there a way to set it up otherwise?

Yes, but you will need to connect the AirPort Express device to the AirPort Extreme router via Ethernet cable.

My macbook internet download speed is extremely slow. I have tried other computers both windows and mac on the same line and speeds are normal. What is the problem?

My macbook internet download speed is extremely slow. I have tried 2 other computers, another mac and windows and the download speed is over 10mb but with this macbook pro it is less than 1mb. What is causing this and how to fix?

To find out how much space you have & what is left, open up Disk Utility/Machintosh HD/First Aid. The info will be at the bottom of the window.
Sluggish Finder - Bunch of icons on your desktop? An overcrowded desktop slows down your Mac.
Get rid of needless Finder calculations - Open a window in Finder/View/Show View Options: ensure "Calculate All Sizes" option is unchecked.
Internet related - It's likely that your broadband connection is the bottleneck. You can check your speed on http://www.speedtest.net to see how fast your connection is. If your web browser specifically performs slowly, quit and relaunch it.
If browser remains sluggish, empty its cache.
Safari/Empty Cache
Firefox/Preferences - select the Network tab of the Advanced preferences and click the "Clear Now" button in the "Offline Storage" area.
Application related - Launch "Activity Monitor" - Applications/Utilities - click the CPU heading and see what float to the top. If an application takes up a large chunk of CPU and won't let it go, it could be dragging down your Mac's performance. Quit it by clicking the Quit Process button at the top of the Activity Monitor window.
Too little ram - max out your ram.
Solution may be found if you search in the "More Like This" section over in the right column.

Network speed seems extremely wild

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