microstutter / slow down with low PO

hy folks

when racing micro stutter happens for around 5 seconds and then the game continous to run perfect fluid @ 60 Fps with PO ~ 20... and after a minute or two the same stutter occurs.

it look's like if the framerate gets out of sync for some seconds... or the CPU or windows does something in the background.


this happens with vanilla, GPxPatch and CSM mods and there is no such stuttering with other games.


system is a intel 9750H (6 core up to 12) with nvidia 2080 mobile, 16 GB Ram, SSD and Win 10 64bit, fixed monitor res @ 60 fps, windows high performance powerplan, all CPU cores are unparked.


i tried so many things:

different f1graphics.cfg, wrappers like Dgvoodoo, dxwrapper, d3d8to9, CPU core settings in GPxPatch and debugger mode, Nvidia control settings like vsync on/off, max pre-renderd frames etc, turning Windows Defender off, disable HPET Timer, Large Address Aware.exe, 4 GB Patch, CFF Explorer, win compatibily modes like xp2, run as admin,...


- any other ideas...? maybe win 10 has problems with DirectX8 or 32bit games?

- does somebody know how to force GP4 to exclusive fullscreen?

thx Johnny



Edited 1 time(s). Last edit at 12/08/2023 08:04PM by JohnnyR.