Seria - you have 400 MB - OR 40% OF MEMORY
I asked Soul2sou ?.
Besides, it is very important how many maps will load at startup - it "weighs" the most, although recently wywaliło my program (and I have 2Gb memory and declared 500 Mb) with the message out off memory - as I put a folder full content 3DCar (256 items).
I removed the redundant skin (2 left).
The program as a whole have to SD