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Comment by saratogacx | Hacker News Reader

If it is mostly your own tooling you may want to look at setting up a dev drive. It is supposed to be more optimized around workloads that would normally spin stuff like defender off the rails.

    System -> Advanced -> 
      -> For developers -> Developer Mode [on] 
      -> Dev Drive -> Create Dev Drive

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I need to write the blog post. I keep being told this, and it’s not the solution.

After a reboot, on an NVMe dev drive with no disk encryption, first launch of our internal application (unreal editor) takes 9 minutes on my workstation. If I disable windows defender before launching it, it takes 30 seconds. If I add all the processes as exclusions, and add the workspace folder as an exclusion to defender… 9 minutes.

edit:

I didn't mean to direct this at you. I mean that it's somehow gained traction as being the solution to slow filesystem access, but the reality is it's just broken.

I'd much rather know that something I think should work won't and where it happens. Bad advice can't become good advice in a vacuum.

I ran a quick test this morning - it took 7 minutes to load the app after a reboot, 90 seconds to load the second time, and 50 seconds after a reboot with windows defender disabled. All on an NVMe drive with basically nothing else running (no browsers or anything). The WPA capture showed msmpeng. That’s with the folder, and UnrealEditor.exe excluded from defender.

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