My Cyrix 486dx2 system had a noticable speed increase when I added more RAM,
so now it has 32 Mb. I also increased the cache to 256K and that seemed to
speed it up even more, but with this old stuff 'speed' is a relative 
word. Anyway, it all helped a lot! 
Before adding RAM or cache check your motherboard manual. Every manufacturer
is different. You usually have to change your jumper settings when changing
the amount of cache. RAM has to be added in the correct sized
chunks in the correct slots according to the motherboard manual.
The old 30 pin memory is getting harder to find, especially in 4 Meg chunks.
It's almost as difficult to find as 72 pin one-sided fast-page memory used
in 486's using 72 pin. And the price for old memory is excessive.
I would not put anymore money into this old system. It's just not worth
the price. I'd buy a new system if more upgrades are necessary.
Probably an iMac. 

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