I imagine he means Mustangs ground texture mod. Its particularly nice and no hit on FPS for me
https://forums.eagle.ru/showthread.php?t=133618
I have stuck with 1.5.6 and have my water set to low. The FPS is definately less although I find it seems a lot smoother regardless. Flying last night with 12 or so others in a large scale mission lots of infantry targets lots of explosions from the F5 CAS ships and it was rock steady. Before you all go down the reversion path try tweaking some settings, it may not be perfect but its still an advance towards unified exe's