[shadowmite]

Upx is a awesome tool, but you have to understand how to use it properly. If you UPX a system dll that is load by other applications then in effect if 3 programs open it you'll have THREE copies of the dll in memory. On the other hand with programs like tomtom which can take 2 megs just for the program file itself, you can reduce them drastically.

The main advantage with upx is for devices short on space which have enough ram to handle it. If you don't understand the tradeoffs or how to calculate what it better, you really shouldn't mess with it.