Windows 10: Prefetch Question

  1.    20 Mar 2016 #1

    Prefetch Question


    Have a file in my prefetch I can find no info on. "dynrespri.7db" Anyone know what this associates with? Thanks.
      My ComputerSystem Spec

  2.    20 Mar 2016 #2

    Welcome to the forum.

    The file is strictly for system use. It was never intended to be opened by an application and there is no association for the extension.

    There are many such private extensions in Windows.
      My ComputerSystem Spec


  3. Posts : 4,765
    windows 10 Home threshold2
       20 Mar 2016 #3

    LMiller7 said: View Post
    Welcome to the forum.

    The file is strictly for system use. It was never intended to be opened by an application and there is no association for the extension.

    There are many such private extensions in Windows.
    Interesting.
    I never really know what the heck is Prefetch and what does it do.
    Too lazy to google for it.
      My ComputerSystem Spec

  4.    20 Mar 2016 #4

    LMiller7 said: View Post
    Welcome to the forum. The file is strictly for system use. It was never intended to be opened by an application and there is no association for the extension. There are many such private extensions in Windows.
    Thank you. I could find no decent info at all on google for this.
      My ComputerSystem Spec

  5.    20 Mar 2016 #5

    davidhk said: View Post
    Interesting.
    I never really know what the heck is Prefetch and what does it do.
    Too lazy to google for it.
    Yeah it confuses me too, it always struck me as one of those things not to mess with and just let Windows do its own thing. I think it has something to do with commonly used apps where parts of the file are pre loaded into RAM during boot for faster access. I guess it's pretty pointless with SSD drives and benefits stuff installed on mechanical drives. But I just leave it alone
      My ComputerSystem Spec

  6.    20 Mar 2016 #6

    The prefetch folder is used by prefetch and by Superfetch. Prefetch files (those with the pf extension) are used to optimize the load time time of applications but does nothing useful with an SSD. Superfetch loads commonly used applications before they are needed. This is all a lot more complex than it appears. Superfetch has only marginal benefits with an SSD but costs very little. There is little documentation available for any of these files.

    There is much nonsense on the Internet regarding both prefetch and Superfetch. Most of what was written about prefetch in the early days of XP was wrong. Nonsense like periodically "cleaning" the contents of the folder.
      My ComputerSystem Spec

  7.    21 Mar 2016 #7

    Prefetch is still useful on SSDs, What prefetch does is monitor the loading of an application and keeps track of everything it loads, every DLL and external EXE. So instead of waiting for the application to call for those DLLs and such, it loads them into RAM when you run the application. That is Prefetch.

    Superfetch on the other hand actively tries to predict what applications you run the most and preloads it in RAM before you run the application.

    Both Prefetch and Superfetch are still useful even on SSDs. SSDs are not that fast compared to RAM not even close. Turning it off was nothing more then nonsense like every other bogus "Performance Tweak" for Windows out there.
      My ComputerSystem Spec


 

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