X performance improved more by?

[Richard Foulk]

>  So I borrowed another 4MB of memory (to 12) and as you would suspect
>it didn't help. Not a bit. So I bought a Cyrix FPU for the system, and
>it did help. The same task now uses about 80% less CPU.
>
>  The Cyrix was cheaper, faster, and lower power than the Intel chip,
>so I didn't have any trouble making a decision. The faster is only
>marginally true for the latest Intel 387DX chips which use the improved
>microcode.

There have been a number of comparisons between the Cyrix and Intel
FPUs.   The Cyrix is apparently faster in the 25MHz version, and the
Intel wins in the 33MHz realm.

Sorry I don't have more details at hand just now.