lock ups (memory management problem?)

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(i am assuming the lock ups are due to low memory, but i suppose its possible it could be something else..)

when running with 128MB and opening many programs/ tabs in mozilla puppy (1.06..but probably all of them) causes puppy to go from working perfectly with no sign of problem or slowdown to a virtual lock-up.. even going to kill the programs takes 15 mins + ..when this is done however puppy becomes fine again (may aswell restart though)

IMO there needs to be some kind of thing which either stops u using the last bits of memory so that it doesn't lock up, or a warning that u are running low on available memory so that u can take actions to stop it locking up.