Having 32 GB RAM, opening Caucasus map in ME, and then opening Syria in ME, Caucasus appears to be flushed from RAM. (when looking in TaskManager DCS.exe RAM usage, it drastically shrinks, and also when then loading Caucasus again, it has quite some loading time.)
please keep map/terrain-data (the .surface5 file I guess ?) stored in free RAM as long as RAM isn't in full use!