MapView does not do anything with Civ4 then reading some xml files. It's pretty much impossible for MapView to break Civ4. I really don't know about the lagging. Especially placing features or bonuses etc. is quite harmless to the cpu. No iterations etc. run when you place stuff. How big is your map? MapView does not understand the keyword. In this case this means it will not be in the map when you save it with mapview. If you want to use it, just add it manually after you finished working on the map with MapView. The recent file list sounds like something i could do sometime. I'll write it down. Also, if you explain how Civ4 needs to be started to load a certain map i could probably see if i can get this "test map" thing done too.