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!

Similar Messages

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.

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.

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.

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

Network speed changes

my network speed keeps changing from 11mbps with an excellent connection to 2 mbps with an excellent conection still, except when it drops i can't connect to the web, then i have to repair the whole deal and it's up and going again til it feels like doing it again which could be in 5 mins or 5 hours how can i fix this annoining problem?

What settings are you using on your router, and which standard are you using to connect; 802.11b or 802.11g
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Slow LAN Networking Speeds after Resuming from Sleep

I use my mac mini as a HTPC running Plex. I have it connected to my Windows media server with 802.11n. Works fine but sometimes after resuming from sleep the network speed drops off to an unacceptable level (from 72 Mb/sec to 5 Mb/sec). Disconnecting and reconnecting doesn't help. Switching to G doesn't help. Only restarting the mini restores the connection to full speed.
None of my Windows clients on the same network have any troubles.
Thoughts?

Looks like Plex might be causing the problem. I always have plex running and it appears as though if Plex makes a request for a file on the share before OS X is done re-mounting it after sleep, it kills the whole process.
Shouldn't the OS be robust enough to handle a situation like this?

Network speed test throughput monitor

I am looking for a quick and dirty speed test to continously monitor the bidirectional throughput of a transponder and POE device while they are undergoing environmental testing.
Would be nice if it could log throughput, dropped packets, and bit error rates between two computers and did not crash when a fault causes one end to stop responding like the C program we have now.
Our C programmer looks at us like we are insane when we ask him to not stop display an errror if the client or server times out.

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.

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!

HH3 slows down network speeds

Not long ago I decided to upgrade from HH2 to HH3. I have a home network where the wired component utilises Western Digital power line devices. I have a network storage device which holds primarily music files. I regularly transfer music files around the network. Not long after installing the HH3 I noticed that file transfers were taking far longer than ever before. I used LAN Speedchecker to discover that the network speed had dropped to around 10% of previous norms. Power cycling of the HH3 solved the problem temporarily but it soon returned. Switching back to HH2 the problem disappears completely. Any suggestions as to why the HH3 may be creating the network speed issues ?

Hi Bob,
Sounds as if you might have fallen fowl of the confused hub syndrome - where the 3 x 100/10 Mb ports on what appears to be quite a few HH3A's (there is a thread not far down the speed/connection list all about it) switch between 100 and 10 Mbps..
I had a network similar to you, but all wired - my main computer connected to the gigabit hub and a 100mb port feeding a network switch that had back up hard drive - printer server and assorted others.
I found that my computer couldn't talk to the back up hard drive - this was down to the gigabit port only allowing an upload speed of 2Kbps(not a typo!). I also saw that the 100 Mbps port was sometimes only connecting at 10 Mbps.
A good point to see what connection has been made is the devices option on the HH - clicking on a device shows that info.
Not sure if this "feature" is on the new HH3B or not.
Hope this helps
Michael

Slow network speed during peak times

I have begun experiencing very slow network speeds in the evening. My Mifi and other devices go from routinely getting 10 MBS down to 1 MBS in the evening. Is there any way to address this?

Rickrdn1,
Thank you for all of the detailed information. The coverage in the area looks great. All of your devices seem to drop in speeds at the same time? How is voice and text working during these times? The coverage in the area looks great, but can still be affected by congestion at peak times of usage. We may want to investigate your area further with a remedy ticket.
TrevorC_VZW
Follow us on Twitter @VZWSupport

Yosemite Drops WiFi Download Speed 25%

I really had no problems with Yosemite on my late-2013 MBP Retina...until I did a Speedtest.net test of my Internet speed, in this case over a wi-fi connection to my router.
I routinely get 55-60 Mbit/sec download speeds, but with Yosemite I got only 40-45 Mbit/sec, roughly a 25% reduction. In case it was just a slowdown from my ISP, I checked using wired Ethernet, which showed my usual 55-60 Mbit/sec throughput. Toggling immediately back to wi-fi, the speed went back down to the 40-45 Mbit/range.
I saw others with wi-fi issues under Yosemite and tried the proposed solutions that some said fixed the wi-fi speed (and wi-fi drops) problems--turn off Bluetooth for one. Nothing helped. So I restored the Time Machine backup of my Mavericks installation and...everything wifi-related is back to normal. Same network speeds as before Yosemite.
Lesson learned--always do a full backup before a major OS upgrade just in case.

Vano3408 wrote:
Having issue on my D6633 since KitKat, now updated to LP 5.0.2 23.1.1.E.0.1 and still same. When I go in 5 meters from router behind 2 walls and signal strength decrease a bit download speed drops almost to Zero, but upload speed is ok.
Please check below video, I have 46080 / 3072 kbps for download /upload... Tried all possible settings combinations without success. Stamina mode never used..
http://1drv.ms/1DjjkcP
When near router 2-3 m without any obstacles download speed is ok.
Any other my phone (Samsunf S3 for ex.) have no such issue in same location...
Please advise what can cause such issue or it is my Sony hardware specific issue ? How can I solve it ?
This issue is not router specific, because same behavior at home and at work.
just in case following settings I have at home: router in mixed mode, 20/40MHz auto, WMM enabled
Download this and take a look which channel of your router had the best signal and make changes on your router to the best channel within 1-11. Try your speed test again to see if this helps.
https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer&hl=en
You may also want to ensure that no body is downloading or torrent if your home network is shared with other users.
I can accept failure.... I can't accept not trying - Michael Jordan

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).

Drop in network speed

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