Windows 10: Set back CPU affinity to default for an application

Hello !I have encountered an issue with a game recently. It was originally designed for a Windows XP SP3 and I'm currently trying to run it on Windows 11. Unfortunately, it kept crashing at various moments with nos real pattern, so I started to dig around for a fix. At some point, I was told that by altering the CPU affinity of said game would resolve the issue. Fun fact : it didn't. Even more so, since it doesn't launch at all anymore and it doesn't appear in my task manager's processes either, so I can't even go back to what it was.I tried uninstalling and reinstalling the game, but that d

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Default affinity for applications set to only use first 4 cpu cores.

The title basically says it all. Recently for some reason most processes are launched with a default affinity (set in task manager) to only use the first 4 processor cores/threads. I have an 8 core 16 thread cpu, so this is utilizing only 1/4 of the CPU and I have noticed a significant decrease in performance. I understand I can manually change the affinity, but doing that for every program each time i reboot my PC is not a solution, so please do not suggest it. I want to figure out why this happened, and fix it.

 

Default affinity for applications set to only use first 4 cpu cores.

Hi there, I had a friend of mine confirm that it was the application setting default affinity, and that does not seem to be the case. we both checked the affinity for the program on separate devices and his was set to use all possible cores, where mine was set to use only the first four. This seems to be a windows issue, not an application one.

 

Default affinity for applications set to only use first 4 cpu cores.

Having the same issue on my laptop. Everything in win11 has affinity set to 4 cores, which I think in my case is 2 physical and 2 HT cores. I have a 6c/12t cpu so not ideal at all.

There is definitely a difference to how win10 and win11 handle default affinity. I never had these issues on win10

The launch shortcut solution sounds like a dodgy bodge rather than a proper solution. I don't want to have to create a custom shortcut for every game and app I install.