@Trisha,

There's nothing wrong with asking questions. What's wrong is to simply land on a thread and ask "what's this for?" without reading the thread.

Doing a search (here or in google/bing/whatever) will also help a lot.

And yes, you're right, nobody is born knowing everything, but if I can give you some advice, the best is to learn for yourself (read read read, and then read some more). Then you can hopefully make an informed question which might benefit everyone.

And to answer your question: with compcache you can make a compressed swap partition IN RAM, which sounds sort of crazy, but has the effect of effectively compressing a part of your RAM, which is obviously good (you get more "real" RAM than the N900 has), at the expense of CPU overhead (compressing/decompressing obviously takes a hit).

In order to use it you need an adapted KP48 kernel as well as a kernel module + the configuration. I for myself am staying away from this (and also from KP48) until things settle and I see a benefit of all this.

I suggest you do the same, as otherwise you will make your N900 an even bigger mess than it is already (unless you really want to experiment that much, but I'd recommend to go one thing at a time, otherwise you will never know which patch/mod brings a benefit to you, and you will also never know what hit you when your N900 is in need of a complete reflash).

In short: take it easy, read, and try not to ask obvious/annoying questions.

Take care.