Windows 10: Weird behavior/ sluggish after handling large files

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  1. Posts : 332
    Windows 10 64-bit home
       10 Aug 2018 #1

    Weird behavior/ sluggish after handling large files


    I've been experiencing a weird problem on my PC for a long time and it's driving me nuts.

    When I first boot it up it's fine, and as long as I don't handle any large files (like tens of gigabytes or larger), it's fine for days. But if I start copying large files from drive to drive, or large groups of files, then it soon starts acting very sluggish, especially when opening new windows or anything that accesses files.

    After I've copied large files, if I open my computer, it takes like 30 seconds for the C drive to appear with the proper "space left" bar underneath - the green "working" bar at the top of the window slowly moves along as it's looking at the drive. It instantaneous when I first boot my PC and stays that way unless I'm working with large files. Same for right-clicking files - if I right-click a file to do something with it, it takes a while for Windows to look at it and give me the right-click menu. Again, it's fine until I start handling large files.

    Also, only the C drive does this. Any other attached drives pop right up when I open my computer, though right-clicking still takes just as long even on other drives.

    The only way to correct it is to reboot, and then it's fine for days, unless I start handling large files again.

    What could be causing this? I have 16GB of memory. I do use Fastcopy for all my copying. Could that be causing the issue? Is it a memory issue?
      My ComputerSystem Spec

  2.    10 Aug 2018 #2

    Could it be that this is related to search indexing in some way?
    if I open my computer, it takes like 30 seconds for the C drive to appear with the proper "space left" bar underneath - the green "working" bar at the top of the window slowly moves along as it's looking at the drive.
    I presume you mean if you launch file explorer...

    Thus if you were copying files to folders which were indexed on C: but other drives were not indexed, might that explain it, if you tried to access C: before the index had updated.

    However, search indexing is designed to back off when you use the PC- so by design should not affect normal use. On that basis, it should not be this.

    You could check this by
    a. looking at Indexing Options and observing the number of items indexed
    b. once indexing is complete, do you still notice any problems when exploring C: ?

    Also try this from an admin command prompt just to check:
    chkdsk C: /scan

    Do you have any form of encryption on C: ?

    To eliminate Fastcopy, try copying just using e.g. 2 file explorer windows.
      My ComputerSystem Spec


  3. Posts : 332
    Windows 10 64-bit home
    Thread Starter
       10 Aug 2018 #3

    I doubt it's indexing. It does not improve until I reboot the PC, so it's not like it only happens briefly after copying.

    I don't use encryption.

    I've done a chkdsk C: /scan in recent weeks and it returned no problems. This has been happening for a long time. Maybe since I built the PC 2 years ago. I can't remember when it started.
      My ComputerSystem Spec

  4.    10 Aug 2018 #4

    Thanks. Again-
    To eliminate Fastcopy, try copying just using e.g. 2 file explorer windows.

    Have you ever watched your task manager or similar whilst the slow behaviour applies? (Green progress bar)
      My ComputerSystem Spec

  5. Berton's Avatar
    Posts : 5,392
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint
       10 Aug 2018 #5

    I've seen issues with copying large files and slowness even with 16GB RAM but have to remember the copy isn't always direct from source to destination, usually copies first to RAM then writes to the destination. The larger the files seems to affect the transfer speed. USB 3 helps if all things are USB 3, computer port, cable, device. It can occur even with NAS drives attached to a Router.
      My ComputerSystem Spec


  6. Posts : 332
    Windows 10 64-bit home
    Thread Starter
       10 Aug 2018 #6

    I'm talking folders of large archived files, like 50GB of multiple rar/zip files. This is happening even when copying from one internal drive to another in my PC.

    Files copy fast, and verify fast, even after the sluggishness starts up. Copying isn't affected. Only initially accessing the folders/files/ C drive.
      My ComputerSystem Spec

  7.    10 Aug 2018 #7

    After I've copied large files,
    - that's what you said.

    Can you confirm you mean the file copying operation is complete (which is what that implies) or something different when you observe the green progress bar?

    And do you observe the slowness on C: only when accessing the copied files, or when accessing any part of C: ?

    Please try a large file copy only using file explorer, wait for that to complete, then see if you have any problems accessing files on C: . Thanks.
      My ComputerSystem Spec


  8. Posts : 332
    Windows 10 64-bit home
    Thread Starter
       10 Aug 2018 #8

    Yes, all copying completes and verifies using fastcopy, and even after I notice the sluggishness at some point after I've finished a copying operation, additional copying is still fine. Just interacting with files, like right-clicking, is slow.

    I'll have to try copying with just Windows file explorer later this afternoon. I'll report back.

    For an example, I rebooted my PC a while ago, and just finished copying 44GB of files (a folder with 25 2GB rar files inside). It finished, and so far my PC is normal - no sluggishness. But at some point if I keep copying more large folders, it will start acting up. It's really weird.
      My ComputerSystem Spec


  9. Posts : 332
    Windows 10 64-bit home
    Thread Starter
       10 Aug 2018 #9

    Well I just rar'd up a 20GB file to another drive using winrar, and now the computer is acting up like I described. So it was fine before rar'ing this file, but now it's sluggish again. So it's not just copying files that leads to this.

    I tend to copy files and archive/rar around the same time, so usually when I do one I do the other after afterwards. So maybe it's the rar'ing up of files and not copying? But why should that be happening?
      My ComputerSystem Spec

  10.    10 Aug 2018 #10

    Hi, have you checked your task manager and resource monitor when this is happening yet?
      My ComputerSystem Spec


 
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