I switched most systems to vulkan and it is indeed faster, I have somethings that I need to clarify.
Why is the screen flickering when I activate fast forward, it flickers when the fast forward starts and ends, and it also does flicker if I switch aspect ratios under video options, can this be avoided?
I also tried taking a screen-shot in Mednafen PSX to show a shader in another topic but Retroarch freezes, so I tried in Genesis GX Plus core and it takes the screen-shot without problems, both are using vulkan video driver.