See! I'm telling you.
Allocating memory, let alone buying more RAM is NOT the solution.

This is what we call a BUG, and a serious one. I dare say LW has NO commercial value until it's fixed!

Besides, the maths don't add up. I've got 128 MB RAM.
My OS takes up 35 MB (9.1 Japanese version), and then
LW takes up apprx. 55 MB.
So, mathematics tells me that I've got 38 MB left.

NOT SO WHEN YOU'RE USING LW!
I'm told I've only 1.7 to 3.5 MB left!! Some kind of maths.

Precise symptom.
1. LW starts up with 35-40 MB.
2. Runs alright for 4-5 mins.
3. Suddenly a rattling noise from my G4/400 (minitower).
4. LW is eating up 55-60 MB (the record was 75 MB).
5. Remaining RAM available is 1.7-3.5 MB.
6. LW goes slow, and eventually slows down beyond my tolerance level.
7. Force shutdown (sometimes unsuccessful)

So, it's bad enough that LW is eating up memories, it's also messing up with the remaining RAM.

Strange developers don't comment on this issue... This thread is not the only one discussing memory problem.