Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: Why does copying files start fast then slow down so dramatically?

12 Dec 2017   #11
Megahertz07

Windows 7 HP 64
 
 

MSconfig doesn't disable antivirus.
Try a test booting in safe mode.


My System SpecsSystem Spec
.
12 Dec 2017   #12
martinlest

Windows 7 Home Premium SP1 64-bit
 
 

OK... I can try, thanks: but to be honest I don't think that's the issue. Why not? Because I have been copying all day and since the mid-afternoon (that's five hours now), the transfer has been running at 30-40MB/s non-stop. With anti-virus on. Had I turned AV off, I would have thought I had found the problem. Easy to make quick conclusions!
My System SpecsSystem Spec
12 Dec 2017   #13
Megahertz07

Windows 7 HP 64
 
 

Normally AV protect it self and it can't be turned off by MSConfig.
Safe mode doesn't load all auto start programs, including AV.
My System SpecsSystem Spec
.

28 Apr 2019   #14
martinlest

Windows 7 Home Premium SP1 64-bit
 
 

18 months on (almost) and the problem is no better.

I am currently copying (or trying to, at least!) a large number of files (100GB+) from one USB3 external HDD to another. All files are exactly the same size, 11MB. I select all the files and copy, either right click and 'paste' or with Ctrl+V. I get about 48MB/s to start with but within minutes that falls. Several minutes later I am at 256kb/sec and the estimated completion time is over two days. The speed will come up again after a minute, but eventaully I never get much faster than 7MB/s or thereabouts as a maximum; more often under 1MB/s. What (expletives resisted) is going on!?

If I reboot, I get the 48MB/s back for a few minutes, but it soon slows down again. Both drives (one a Lacie 5TB, the other a WD 4TB) are enabled for 'Better Performance' and have write caches enabled. Is there any more I can do? I am sure the problem is Windows, not the drives, because I get this on all the external drives I have, though to varying degrees perhaps.

Copying via script (XXCopy) also slows down... I already use TeraCopy for moving/copying files... No AV running...

CheckDisk showed zero errors on the drives. Windows Defrag showed 0% defrag, which is very unlikely. Maybe the innate defragger can't deal with drives of this size?

Anything else that might help?

Thank you.
My System SpecsSystem Spec
28 Apr 2019   #15
badcrc

Windows 7 Pro x64 sp1
 
 

My System SpecsSystem Spec
28 Apr 2019   #16
martinlest

Windows 7 Home Premium SP1 64-bit
 
 

That's about right!

The reason why the problem seems a lot worse when I use a particular drive, a Lacie 5TB (though as I say, none of them is immune, to say the least) is that it is probably on the blink... it seems to lock up Windows Explorer every so often and prevent the PC from shutting down: the disc light just keeps blinking very quickly. It is more likely to slam on the read/write brakes than my other external drives... As it is still under warranty (just!), I am returning it for a replacement, since I don't seem to be able to get a refund after almost 2 years (and have ordered another (4 TB WD) drive to replace it meanwhile: expensive business this!).

Nevertheless, all my drives suffer from the same malaise to a certain extent (courtesy of Windows 7 I imagine?), so any suggestions for improvements are still very welcome.

(Is there any way to get the files to copy in 'DOS', on reboot, before Windows boots up. Or maybe this possibility was lost long before Windows 7? Or perhaps that wouldn't help anyway??).
My System SpecsSystem Spec
29 Apr 2019   #17
martinlest

Windows 7 Home Premium SP1 64-bit
 
 

Thought I'd try the copying via my Windows 10 laptop, but there's the same problem. The speed is all over the place.. 4-5 days estimated (at worst) to copy 2TBs. 18 hours, at best (welcome to 'ultra fast' USB-C!! How long should copying 2TBs take in theory, according to the USB specs?).

I guess that, yes, that is Windows... nothing much to be done about it.
My System SpecsSystem Spec
1 Week Ago   #18
martinlest

Windows 7 Home Premium SP1 64-bit
 
 

One thing I have noticed over the past several months of trying to copy large amounts of data (mostly via USB, HDD to HDD): if I drag and drop one single folder, no matter how large it is, from the source to the destination, the copy speed almost never slows down. It can run for an hour or more at a reasonable speed. However if you drag and drop (or copy and paste via the keyboard) multiple folders (including folders containing subfolders), then the copy speed invariably drops to a crawl. Similarly with a batch script...

So in desperation to get stuff backed up this week I have spent hours dragging individual folders across from one screen to another - an annoying waste of time, but at least the copying goes ahead 'full speed'. (I have also, for the largest folders, containing hundreds of subfolders, written batch scripts which copy each folder separately - the script may have hundreds of lines in it. That also runs without slowing down, usually, but can take a long time to set up).

Fortunately, I have finished 95% of the backup now - some 5TB of data - and hopefully won't need to do this again for a long time to come (fingers crossed), but why should what I have written above be so? Any ideas? The files being copied are all of identical type and size (11MBs).
My System SpecsSystem Spec
Reply

 Why does copying files start fast then slow down so dramatically?




Thread Tools




Similar help and support threads
Thread Forum
Fast to start, slow to login
I have a user account that takes a rather long time to log into. There is a large amount of data on the desktop. Is that affecting it? The system is windows 7 64-bit, all the startup options have been disabled and this is still happening. The only thing currently running that is not a...
Performance & Maintenance
Win7 Very slow normal start, Safe start with Net -fast
When I allow Win 7 to load normally, all actions are very slow. Takes 15-20 sec to bring up Google in newest Explorer. Frequently hangs-website not responding. If I load system in safe mode with network support, runs very fast (1-2 sec ot open Google) No hangs. I get error message with normal load...
Performance & Maintenance
Copying/Moving Files why so slow?
Hello All, Since I got Windows 7 I have learned it is the same as Windows Vista not much difference, well except the new boot loading screen. Anyway why does it take so long for this to copy or move files? I am copying moving 4GB of data from my USB to my external hard drive and it takes...
Performance & Maintenance
Why is 7 so slow while copying large files between part
Everything is so slow e.g. opening of FireFox, opening of Excel, opening of Task Manager etc...while I'm copying 750GB of data from one partition to another partition......why? I'm running Windows 7 x64 7100 on a seperate partiton and I have a Q6600, 4GB ram and 5 X 1 TB WD Black edition...
Performance & Maintenance
Copying files seems slow
I am currently backing up files in preparation for my new hardware. I am copying file from a samsung F1 1Tb drive to another identical drive. I thought that these drives were fast, capable of around 40mb/s but atm the process is only managing 19mb/s.
Hardware & Devices


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 06:23.
Twitter Facebook