It depends what mode do you like. In 1v1 I have 80+(I capped this with my radeon drivers to 90 for lower temperatures, FPS drops to ~70-75) FPS with my i5 750 3,8GHz(OC), Radeon R7 250X 1GB and 12GB RAM on high settings without stuff which kills FPS like antyaliasing, vsync, shadows(OFF), postprocessing, raindetail, snowdetail, ambocclquality and physics.
Satchel costs 45 munitions and can rekt every single building in the game but it has 3 seconds explode time and you must get T1.
In my opinion satchel cost should be increased a bit(50-55) and heavy gammon decreased(60-65). Some of the grenades cost 45 munition. Where is logic?
Btw. Commandos light gammon bomb(0,5s explode time and 35 munition) and infiltration tactics grenade are OP vs buildings compared to the other grenades.