Latest mesen (NES) core seems to be buggy with runahead enabled. When enabled, gameplay is slow and flickering constantly. It does not matter if second instance is used or not. This did not happen with the previous mesen core version I was using before updating (it was from september).
It’s not a performance problem, I have an I7-6700k.
Happens on all video backends on Windows 10 x64. Tried on 2 different computers.
Seems like a legit bug? Can anybody confirm?