Hi,

> I'm using apm (without acpi), compile kernel and userland with -O -pipe
> and packages with -pipe -O3 -march=pentium3 -mmmx -msse -msse2 -mfpmath=sse

GENERIC_LAPTOP or your own config?
I recommend -Os -pipe -mcpu=i686 -fomit-frame-pointer :)
(drop the last option when building mozilla from source)

Kind regads,
Adam