Heavy Stuttering, unless mouse is moving.

[akimbler]

I'm not quite sure where to begin with this issue because I'm really confused about it myself. I'm attempting to run the LRPS2 core on a system with:

• Ryzen 5950x
• GTX 3090
• Fedora 42

This machine should be overkill for PS2 emulation, and I've ran PCSX2 great on the same machine, but the LRPS2 core is a stuttery mess. I tweaked all settings and attempted multiple renderers, all stuttery. The stuttering even occurs when just launching the PS2 bios with no game loaded. During this troubleshooting I noticed something odd, when I would pause to go to the menu (I attempted this with no controller, just keyboard and mouse) the stuttering would briefly go away as I would move my mouse. I attempted this with the actual emulator launching a game, and lo-and-behold the stuttering completely disappeared as long as the mouse continued to move.

[akimbler]

This seems to actually occur with all human-interface devices I try, I can replicate it by spamming buttons on the keyboard (although with substantially worse results due to lower polling rate). This only seems to impact specifically this core from what I can tell.

[jinnko]

I'm seeing this issue on RetroArch 1.21.0-2 with both the kronos core 7016-2 and the beetle-saturn 2:r563.ccba526-1 core built from git, so I believe it may not be limited to the ps2 core.

EDIT: found this reddit thread suggesting it's a RetroArch bug. After updating to the latest git build 1.8.7.r89.7cbb79277d-1 the issue appears to be resolved.

[akimbler]

The thread suggests that 1.22.x fixes the issue, but I just installed it via flatpak and I'm still getting the same issues.