This is all normal behaviour, the WHDLoad icons tend to be rather big, colourful icons that steal away your precious chipram. One way to improve the situation is to replace the icons with simpler icons, or use a dedicated WHDLoad launcher. Also, adding FastRAM helps, which on A600 means either getting hold of an acc-card or RAM card to fit inside the PCMCIA slot. These days, getting an acc-card is easier. Trapdoor RAM is only use to increase chipram from 1MB to 2MB, as you have seen.