So as a mission maker, a badly optimized map or a map that causes spikes in FPS can tank even the most well thought out campaign.
That being said...I figured I'd start a thread for folks to post not their "favorite" maps..but the maps they have had the best experiences FPS wise on.
Personally....
Song Bin Tanh (APEX version) This map is OUTSTANDING. Our current campaign is running on here and even with dozens of units engaged around us...server FPS rarely dips below 30. Very few spikes or points where the FPS chugs even when driving fast down some of the roads. PLUS...it's gorgeous.
FATA... Always have great FPS when using this map for missions/campaigns. Even in the highly populated areas....Server FPS stays above 30 in 99% of instances. My second favorite Middle East map behind Sangin (which is not as well optimized).
Sahrani....A great older map that always does well in big campaigns with our group.