I would write my frustrations if the cookies of my login didn't run out and ended up deleting my draft so I'll make it quick before a vein pops; Platform stutters, no matter what I do, at random intervals. There's no cart (it's so annoying I cannot even write code). I've tried to:

• Reinstall older versions.
• Cleaning the pico8 roaming folder.
• Nvidia drivers and settings (vsync and such).
• Change foreground_sleep_ms and host_framerate_control.

This started happening after I upgraded to windows 11, before that I had 0.2.1 and I had no issues.
Please help.

Some process with higher priority than pico-8 must be launched intermittently an hog the same core pico-8 is running on.
Use task manager and look for CPU spikes and find the source.
Some built in OEM "free" security packages can sometimes be the cause.
You can also try to see if things stop stuttering when the computer is offline. Some malware might be using your computer as a source of CPU for e-currency mining.

Start by putting the computer offline and do a virus/malware scan. The problem is very likely not pico-8 related.