Tuning
Performance tips
Renderer
Vulkan first on Windows; if a game glitches, try OpenGL or software and check the wiki.
Upscaling
Increase gradually. Broken bloom or effects often mean less scale or a hardware fix for that serial.
EE / VU hacks
Change one setting at a time; some games break timing if pushed too far.
System
High-performance power plan on laptops; reduce overlays; consider AV exclusions if you see stalls.