slow large file network copy. win7 to win7
can someone else with access to two win7 computers try this out because i'm yanking my teeth with 2MB/s transfers on gigabit. and this is with a fresh install on both computers too so no tweaks or anything.1. copy a large file (1-10gig in size) fromcomputer 1 to computer 2using windows share not homegroup. note speed.2. go to computer 2 and copy large file to computer 1. note speed.here's what i'm getting. it starts fast (50MB/s) but then starts to drop every few seconds until it hits 1-2MB/s about 30 seconds into the copy.this part is important. you have to copy a fresh file over otherwise it acts as if the file was cached or something. i've tested this numerous times. if you copy a file the first time it'll be slow. delete that file on the 2nd computer and copy it over again and it'll be fast to copy. you can do this as many times as you want and the copy will be fast, but as soon as you try to copy over a new large file the speed drops down to 1-2MB/s again!p.s. i tried this both on a gigaswitch and through a crossover cable and the results are the same. if it matters one of my nic's is a realtek and the other is nforce.
May 13th, 2009 7:03pm

What speeds do you get on smaller files? Do you ever get full speed? Can you try setting your NIC speed to 1000Mbps Full duplex (on both machines) instead of auto and see if that helps?
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June 25th, 2009 6:16pm

also same problem! Win7 - Win7 copying a 700MB video from Homegroup share. Can get up to 1MB/s, but usually less across G wireless. Has anyone tried wireless file copy speed across homegroup? This is horribly slow!
October 30th, 2009 9:52am

Slow as a dog on both copy and delete. I can watch the files being transferred and deleted. What is win7 doing? Logging and journaling each byte? I also get about 1MB max on transfers. Driving me crazy. Have not yet tried DOS copy to see if it's any faster.
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November 23rd, 2009 6:54am

I use an external hard drive and I get 30-40 migabytes a second both from computer to HDD drive (LaCie 750 GB, nothing to fancy here) and samething from LaCie to computer. I have it plugged in through a USB, try that. As for home sharing and wireless routers it will be slower but slowest I experience with an N router was 3Mbit/s. Unless you guys are using NAS servers then speed is going to be slow (with exception of HDD drive being plugged in through USB).
November 23rd, 2009 9:04am

Not really a helpful response there Genericuser, unfortunatelly for a gig ethernet connection you should be seeing speeds on most systems of around 70meg for transfer rates as that is the limitation of the bus between harddrive and ethernet adaptor, so im sorry your incorrect in your assesment of the situation. Im also trawling many many posts in regards to these slow transfer speeds looking for an answer, which there seem to be 100's of ideas but no solid solution as yet. Google searching is throwing up countless results. On this site alone there appears to be 100's seeking answers to this solution and they are only the ones that have posted, Many many more would have got to a stage like I have and seen microsoft respond with basic tool tips for the unknowing as far as networking is concerned and not suggesting a correct solution. I have seen posts that blame peoples routers, their inability to produce a functioning network, faulty hardware, bad drivers, loads of things suggested by microsoft just to see the same people respond with tried and didnt work. This is clearly some sort of programming issue with Microsoft but true to most large coorporations they do not wish to admit there is an issue, and probably are not paying any serious attention to the issues people are having. You never know we may get some random KB******* update in a couple of years fixing the problem.
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October 19th, 2010 12:54am

I know this won't help your situation, but I consistently get 65MB/s or better, machine to machine. My only pain point in the entire network is my WD WorldBook "NAS" that can't seem to go any faster than 16.6MB/s for a short time at the beginning of a transfer, then slowly works it's way down to 14-15MB/s. So, it's not a Win7 limitation or glitch, otherwise I'd be having the same problems you are. My network is based on Cisco SB RVS-4000, a Cisco SB EG0008W 8 port 1Gb switch, Cisco SB EG005W 5 port 1Gb switch, and a Linksys WAP54G for wireless. I get the same reasonable 65MB/s while going from a machine direct connected to the RVS-4000 to another machine direct connected to that same device, as I do to a machine downstream behind both the switches mentioned. I did nothing special to acheive this, but I'd be glad to learn more about your setup and perhaps dig a bit deeper. If you want some help, I'll do what I can, we can compare settings and whatnot, whatever it takes to get you going. DAS
October 19th, 2010 1:49pm

Have you tried to disable Remote Differential Compression? : 1. Click Start – Control Panel – Programs – Turn Windows features on or off. 2. Uncheck "Remote Differential Compression" and click OK. 3. Restart the computer and you should see an improved performance with copying files. That worked for me.
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March 1st, 2011 8:41am

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