Hi,

I also noticed that the RAM usage was excessive, the performance monitor 
reports 426MB of RAM, when using just Firefox and Gaim, and another 41MB in 
swap space.

You can check yourself the memory utilisation from mdb ::memstat.
You have already reported the figures.

> ::memstat
Page Summary                Pages                MB  %Tot
------------     ----------------  ----------------  ----
Kernel                      17569                68   14%
Anon                        60162               235   47%
Exec and libs               13767                53   11%
Page cache                   4320                16    3%
Free (cachelist)            28327               110   22%
Free (freelist)              4765                18    4%

Firefox/Thunderbird/Open Office would need at least 512MB
outside of the OS. I would suggest you buy more RAM, if possible.

 > My system:
AMD Athlon XP 2000+ (1.67GHz)
512MB SD RAM

Well depends what are you planning to do with this box.
512 MB for JDS (Gnome) is very limited I would say.
I had 2GB and switched to FVWM2 instead of JDS, I have lots of terminals opened.

So:

1. Try, if possible to allocate more RAM. Increase to 1GB.
You will see 100% a performance improvement.

2. Check CPU utilisation/saturation (learn how to use vmstat and sysperfstat [1])


Cheers,
Stefan

[1] sysperfstat
http://www.brendangregg.com/K9Toolkit/sysperfstat
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