I had a quick look at this and found that it does indeed fill up the main memory slowly but not the vram. Each time you switch games it seems to allocate some more memory somewhere that doesn't get freed until program exit. I am pretty certain this is happening inside the emulator core somewhere so it might be difficult to track this down. Seems to correspond to the size of the rom loaded so I will start looking there. Maybe I will try switching from fixed rom buffer size to dynamic allocation and see if that helps the situation. Will investigate further...