Well give it a try then :-) and see if the gfx & sfx happen at the same time. If the sound fx happens 5 seconds after the event then your puter is to slow. Even if it happens 1 second afterwards then your puter is to slow. Gfx & sfx are perfectly syncronized and instantaneous on real A1200s.
p.s. You must run WinUAE in "32 bit color mode", popularly referred to as "16 million color mode" because all Amiga 1200s have 16 million colors and Total Chaos AGA uses all of them.
I hope it runs at full speed for you.