If you are low on physical memory, then precompiled headers are the first thing you want to turn off.
While precompiling the SDK, gcc can easily eat up 350 megabytes of RAM.
Good to know, trough I had preffer to disable the plugin rather than disabling precomp headers.
Personally, I'd advise to get more RAM though, it's not like RAM is expensive these days. Every ElCheapo PC from a supermarket has a gigabyte these days.
Look, Germany is currently the most cheap (western) country to buy electronic devices. Most things are even more cheap than in USA.
So, keep in mind that in other countries, the word "not expensive" doesn't apply there.
Here, for example, every "ElCheapo" PC from a supermarket has 128 MB these days, and thanks to the monetary and importing differences, it can be even a lot more expensive than what can be 1GB in Germany.
I wanted to buy one stick more, but my motherboard is very conflictive (advice: never buy a mobo with ATI northbridge chipset).