I think, my first A500 has still got its '010 inside - in my memory it was like 0-3% faster, in synthetic benchmarks you could read 20%.
I gained quite a bit more by replacing the system clock with a 32 MHz crystal :lol: - my very first overclocking job, 11% faster. My Profex/Philips monitor whined quite a bit about the increased horizontal frequency - but even the blitter was faster. No that I think about it: it probably was the fastest Amiga blitter ever (outside C=). :-D