It that for audio (Paula compatible) or the 68K CPU?
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68k.
In regards to speed, it’s fine on 1.33Ghz Athlon model 4. Also, it can’t be slower than WinUAE-JIT, i.e. emulates the entire Amiga Classic ecosystem.
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Well, as I said, on Amithlon, it's done externally afaik.
Such stuff have no place in a cleanly made OS.
About UAE now, that emulates the whole, synced,
environment and speeds the whole thing up to become
faster. That's not how it could work on a native OS.