Differentiation in networking speeds

While connecting to my AEBS, my MBA is not achieving download speeds nearly comparable to my desktop iMac (connecting my iMac wirelessly to the AEBS).
The networking settings are the same for both machines, but my MBA is slogging with download speeds, which are reporting to be slower (by a factor of 2x) than my upload speeds (my iMac speeds are much faster and near parity on the up-and down-load rates).
I'm connecting to the internet via Comcast 50 service, which is connecting to a Linksys WRT610n router. The AEBS is connected via ethernet.
Any thoughts??

hi,
i was using the daq assistant but am now using daqmx vi's . do i connect dt to the clock? at the moment i have it connected to 1000 to be the same rate as the clock
Attachments:
example.vi ‏169 KB

Similar Messages

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

How to track network speeds - maybe through SQL or open to others

The network speed is dramatically slower to the SAN, but it also makes me wonder how slow things are between the Webserver and the external world.
What's the best way to monitor what-I-assume are network delays and which part of the networks are causing the problem.
-- Needs to be run on the VM Machine xxxx to work
/* Local backup */
BACKUP DATABASE [play_pen] TO
DISK = N'x:xxxx\testbackup.bak' WITH COPY_ONLY, FORMAT, INIT,
NAME = N'Speed backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10, CHECKSUM, CONTINUE_AFTER_ERROR
-- BACKUP DATABASE successfully processed 35289 pages in 7.638 seconds (36.095 MB/sec).
/* Intra-Network backup*/
BACKUP DATABASE [play_pen] TO
DISK = N'\\xxxx\testbackup.bak' WITH COPY_ONLY, FORMAT, INIT,
NAME = N'Speed backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10, CHECKSUM, CONTINUE_AFTER_ERROR
-- BACKUP DATABASE successfully processed 35289 pages in 14.152 seconds (19.480 MB/sec).
/* SAN backup*/
BACKUP DATABASE [play_pen] TO
DISK = N'\\xxxx\testbackup.bak' WITH COPY_ONLY, FORMAT, INIT,
NAME = N'Speed backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10, CHECKSUM, CONTINUE_AFTER_ERROR
-- BACKUP DATABASE successfully processed 35289 pages in 55.106 seconds (5.002 MB/sec)

Hi,
You can use the tools like Resource Monitor and Network Monitor.
Resource Monitor is a tool that you can use to monitor the usage of CPU, hard disk, network, and memory in real time. You can open it by clicking the
Start button. In the search box, type Resource Monitor, and then, in the list of results, click
Resource Monitor. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.‌
Meanwhile, I think it is proper to dig the networking issue on the Windows Server forum via the below link.
http://social.technet.microsoft.com/Forums/en-US/home?forum=winservergen
Additional information:
Using Network trace to troubleshoot intermittent connectivity issues
http://blogs.msdn.com/b/dataaccesstechnologies/archive/2010/06/18/using-network-trace-to-troubleshoot-intermittent-connectivity-issues.aspx
Thanks.
Tracy Cai
TechNet Community Support

Set network speed & mode in Solaris 10

Hi all,
Can someone know how to change the network speed and mode in solaris 10 SPARC
I tried with ndd -set , is this valid for Solaris 10
How can I check the speed and mode
Regards,
Hakim

It depends on what type of interface card you have, but basically you can use ndd -set and ndd-get commands on most of the NICs in a Sun box:
Network Interface Cards documentation:
http://docs.sun.com/app/docs/prod/net.inter.crds#hic
I have bge cards, so, I run this command to see what parameters I can alter:
ndd -get /dev/bge0 \?
? (read only)
autoneg_cap (read only)
pause_cap (read only)
asym_pause_cap (read only)
1000fdx_cap (read only)
1000hdx_cap (read only)
100T4_cap (read only)
100fdx_cap (read only)
100hdx_cap (read only)
10fdx_cap (read only)
10hdx_cap (read only)
adv_autoneg_cap (read and write)
adv_pause_cap (read and write)
adv_asym_pause_cap (read and write)
adv_1000fdx_cap (read and write)
adv_1000hdx_cap (read and write)
adv_100T4_cap (read only)
adv_100fdx_cap (read and write)
adv_100hdx_cap (read and write)
adv_10fdx_cap (read and write)
adv_10hdx_cap (read and write)
lp_autoneg_cap (read only)
lp_pause_cap (read only)
lp_asym_pause_cap (read only)
lp_1000fdx_cap (read only)
lp_1000hdx_cap (read only)
lp_100T4_cap (read only)
lp_100fdx_cap (read only)
lp_100hdx_cap (read only)
lp_10fdx_cap (read only)
lp_10hdx_cap (read only)
link_status (read only)
link_speed (read only)
link_duplex (read only)
link_autoneg (read only)
link_rx_pause (read only)
link_tx_pause (read only)
loop_mode (read only)
msi_cnt (read and write)
drain_max (read and write)
speed:
ndd -get /dev/bge0 link_speed (Note that this is read-only attribute)
100
duplex:
ndd -get /dev/bge0 100fdx_cap (read/write atrribute)
1
etc...
To set duplex during boot, I do this:
cat /etc/init.d/NICtune.s
#!/sbin/sh
# This script tunes the NIC to 100 Full Duplex
case "$1" in
start)
ndd -set /dev/bge0 adv_1000fdx_cap 0
ndd -set /dev/bge0 adv_1000hdx_cap 0
ndd -set /dev/bge0 adv_100fdx_cap 1
ndd -set /dev/bge0 adv_100hdx_cap 0
ndd -set /dev/bge0 adv_10fdx_cap 0
ndd -set /dev/bge0 adv_10hdx_cap 0
ndd -set /dev/bge0 adv_autoneg_cap 0
stop)
continue
echo "Usage: $0 { start | stop }"
exit 1
esac
exit 0
ln -s /etc/init.d/NICtune /etc/rc2.d/S99NICTune
HTH
John

Standard local network speed test?

I recently setup up a dual-band (dedicated n, dedicated g) wireless network, and I think I am having some issues with throughput (qualitative observation). So I started trying to find a good metric for performance of the wireless systems. Note, I am talking here about the local wireless (Airport devices between home computers), not the connected internet speed (cable, DSL, fiber).
I see a lot of people copying files and timing the transfer. Is this the best there is? From what I've read, ping isn't such a good metric for network throughput. You can watch the kb/s transfer report on copy, but that isn't exactly stable or indicative of general performance. Any other tools, programs, methods, etc.? Or should I just be timing file transfers?
Thanks!

Yes, I know how to handle and suppress errors in LabView. I was mainly looking for a good example on a network speed test.
The test we have uses was written by one of our software guys, it uses two computers in a client-server arrangement and stops and displays an error message when the client computer loses connection to the server. Regardless of the reasoning I have given the programmer refuses to change it because he wrote the test for him and that's how he wants it.
I want a program that can use one computer with two network cards.
It will send a data stream out one NIC, through the UUT, and back in the other NIC.
Where it Will be checked for errors and dropped packets, and sent back through the UUT.
A continuous throughput speed measurment will also be logged along with errors, dropped packets, and retries.
I have never used any of the LV networking, tcp, etc VI's and was hoping someone had done this before because I do not have time to start from scratch.

OVM 3.0 - network speed

Hi together,
quick question regarding domU network throughput in OVM 3.0.3.
We did a very simple TCP Network Throughput Benchmark with NETIO and ended up with the following result.
Setup:
- OVM Server 3.0.3 on x86_64
- OVM Guests OEL 5.7 64bit (2.6.32-200.13.1.el5uek) PVM with xennet
- 10Gbit physical network (especially for the bonds serving the VM network bridges)
Network Speed between two different dom0`s:
Packet size 1k bytes: 320.12 MByte/s Tx, 302.97 MByte/s Rx.
Packet size 2k bytes: 367.94 MByte/s Tx, 472.63 MByte/s Rx.
Packet size 4k bytes: 694.60 MByte/s Tx, 841.67 MByte/s Rx.
Packet size 8k bytes: 953.76 MByte/s Tx, 972.38 MByte/s Rx.
Packet size 16k bytes: 1012.60 MByte/s Tx, 1.017 GByte/s Rx.
Packet size 32k bytes: 1.002 GByte/s Tx, 1.008 GByte/s Rx.
Network Speed between two domU´s running on the same dom0:
Packet size 1k bytes: 354.65 MByte/s Tx, 382.91 MByte/s Rx.
Packet size 2k bytes: 468.07 MByte/s Tx, 473.96 MByte/s Rx.
Packet size 4k bytes: 495.54 MByte/s Tx, 575.83 MByte/s Rx.
Packet size 8k bytes: 526.07 MByte/s Tx, 548.81 MByte/s Rx.
Packet size 16k bytes: 533.61 MByte/s Tx, 603.46 MByte/s Rx.
Packet size 32k bytes: 571.73 MByte/s Tx, 650.30 MByte/s Rx.
Network Speed between two domU´s running on different dom0`s:
Packet size 1k bytes: 155.06 MByte/s Tx, 156.07 MByte/s Rx.
Packet size 2k bytes: 176.94 MByte/s Tx, 196.74 MByte/s Rx.
Packet size 4k bytes: 185.37 MByte/s Tx, 200.06 MByte/s Rx.
Packet size 8k bytes: 157.51 MByte/s Tx, 218.15 MByte/s Rx.
Packet size 16k bytes: 191.40 MByte/s Tx, 202.36 MByte/s Rx.
Packet size 32k bytes: 185.55 MByte/s Tx, 204.82 MByte/s Rx.
As you can see, the domU`s on two different OVM Servers have arround 80% performance loss compared to the available speed on the dom0 layer.
2 domU´s on the same dom0 are around 50% slower.
Is that normal?
If not, what can be tweaked?
Some reference measurements on other environments would be great.
Thanks,
Claudius

I had a similar slowdown due to dropped packets (and the necessary retransmissions) using a private network on a single host. See thread: Re: Private network dropping packets
It resulted in a bug but there was a workaround. I'd do an 'ethtool -K eth0 rx off tx off sg off tso off' and then an 'ethtool -K eth0 rx on tx on sg on tso on'.
a) the second command undoes what the first command does,
b) my network path does not include eth0 in the link that is dropping packets!
c) the commands must be repeated after any host reboot.
I have no idea what might be the underlying cause - my guess is an obscure race condition in the Oracle xen network stack - so I have no idea if this workaround will affect your issue. You can try the pair of commands on both hosts (pick any interface) and see what happens. You also might look at the traffic to see if dropped packets are the problem and pin down where they are being dropped - that will be tedious!
Good Luck!

Looking for Third Party VPN W/O Significant Network Speed Hit

As the title indicates, I am looking for a VPN app (Windows) which will not significantly ding my network speed. I have FiOS (75/35). I understand there is normally a speed drop while connected to a VPN but dropping from 75Mbps to 1.5Mbps is unacceptable. I have only tested Spotflux so any other suggestions would be appreciated.
To clarify, any app would have to be compatible with PeerBlock. I do not care about advertising as Ad Block Plus takes care of that. As for speed, on average, I would expect no less than 20-30Mbps. Also, I want the ability to choose my own servers (whether foreign or domestic).

Check out https://www.ipvanish.com
I'm on a mac, but the windows app works well too. While connected to one of the Miami servers, which are in the same state as me, I can often get nearly my full 75 Mbps down when using openvpn (udp). IPVanish has servers around the world, some have better speeds than others. Your speed will depend on a few factors, distance from server being used, server load, etc. For best results I'd suggest using one of the "A" servers, example mia-a01, lon-a02, nrt-a01, etc.

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.

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!

How to test network speed

How do I test the speed of my network to determine if Time Capsule or my Internet provider is behind a real slowdown in my internet access. I ran the java test at DSLReports.com and got the following results:
Compared to the average of 971 tests from comcast.net: download is 98% worse, upload is 98% worse.
I'm unsure where to look or what to look for in trying to find a cause for the problem but wanted to at least try and make a stab at finding out before I called Comcast.

You could try connecting a computer directly to your broadband modem and run the test again. That would remove the Time Capsule from the configuration. You may need to reset the modem to convince it to connect to a "new" device.
Are you connecting to the Time Capsule via Ethernet or Wi-Fi? If by Wi-Fi, the quality of your Wi-Fi connection could have a big affect on the network speed. In that case, use the advice in the second message of this thread to investigate the signal and noise levels that your Mac sees:

Slow Network Speed with MacPro

I just received 4 MacPro's with the dual quad processors. I have configured 3 for our workplace and have moved them into production. We are experiencing very slow network speeds, a test file on our server of 100mb takes 2 minutes 20 seconds to copy to the desktop. I have manually set the ethernet port to 100baseT with full duplo. The old machine is running the same OS 10.4.10, and only takes 12 seconds to copy the file. I should mention that we use DAVE to connect to our servers, both machines are running the same version of DAVE, and using a third machine I connected to both drops and the file copied in 12 sec, showing that the network is physically OK. The only difference between the two machines is that one is the intel version? Can anyone offer any thing to try?
Thanks
Message was edited by: Mark Crane
Message was edited by: Mark Crane

I am 99% sure someone else had 'slow transfer' in another thread.
Sometimes a router needs firmware update to be compatible, or upgrade the cables to cat6e, or look for a new router or switch which helped my own setup. Just look for one that says that it is "Vista compatible" actually.
http://www.thursby.com/products/dave-vs-tiger.html

MacBook Air 2010 network speed drop sharply after download starts

My MBA 2010 started having network issue a few month ago. The symptom is:
1. Sometime, the network speed (both in and out) drops to 0B/sec suddenly and all connection died, then comes back after a few sec.
2. When downloading large files, the initial download speed was great, 2MB/s, but sharply dropped to 20KB/s after a few sec. And never increase.
I have another MacBook Pro on the same home network. Never had such issues with it. I also tried to download the same file from both machines at the same time or one after another. No matter which way, my MBP can consistently have 2MB/s speed, but my MBA only had 20K/s.
I had this issue with MBA when it was running snow leopard. And I thought it may deal with OS. So just upgraded to Mountain Lion (clean install). But still the same issue.
But when speedtesting with www.speedtest.net, MBA still works pretty good, 18mbps download, 4mbps upload. This really confuses me. I begin to suspect if my airport adapter is broken or getting flaky. Any help or suggestion will be appreciated.

Ok, when I take the MacBook Air into the room with the Airport Express the Internet Connection works well and the Airport Utility shows the Phy Connection as 802.11 a / n as opposed to 802.11 b / g / n
Does this tell me anything about why when connected to the Network via the Airport Express that I am having trouble connecting to almost any URL? Sometimes it connects but very slowly. When I do get through to the Speedtest things look Ok but with some serious valleys in the graphic.

Differentiation in networking speeds

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