You are wrong. EFIKA is not powerful enough for smooth UAE emulation. Some light games might run fast enough, but anything more demanding will not.
Once upon a time I used to run UAE on a PII@350MHz: it could run most A500 games just fine, if a bit jerky on the sound side.
- Edit -
Not meaning that it would run fast enough on the Efika, though, just saying that a "slow" CPU can still produce good results with UAE.