🚀 go-pugleaf

FM uses up around 3.5 MB RAM when running idle and no document open (only 750k when minimized). Opening large docs it goes up to around 40% and calms down once the document is open. This is under XP Pro, 384MB RAM... As far as observed here it handles memory quite efficiently, as it renders only the visible part of the document, so even extremely large docs do not cause severe trouble (but unfortunately requiring manual Ctrl+L refreshing more often than not...) 
Two possibilities come to my mind: Did you install any add-on tool (API client) that might be poorly coded (had that once). Otherwise we had odd crashes and memory consumption using Matrox graphic cards (program termination on using the scrollbars in the document window and when re-sizing anchored frames). This was with G400 and G450 cards. According to Matrox this indicates non-standard Windows API calls (16-bit?) used to draw the windows... But knowing the stability of Matrox drivers I would not take that for granted. Trying to solve the issue with the German Adobe hotline caused even more confusion... I needed more than 2 hours to find somebody confirming FM is an Adobe product! 

Uwe