This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
In terms of raw performance (once you arrange for cooling), SpeeDemon may
be the best of the 4MHz accelerators for early II's. I've never noticed any
compatibility problems and the approx. X3.5 speed increase puts real 'snap'
into your machine's response. (Besides, it's great for games like Elite!)
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