This sim is flyable with a "Low Specs PC"

[RickRuski]

Have just found about a 5fps rise with one little change. When you launch your mission with cockpit "on" you can see most of your dash board, in the bf109 though the gunsight reticile is off set. Hit "Shift-F1" not only will it give the 109 reticile centre but also about 5fps increase (at least it does with my system) with all cockpit views.

Don't know if anyone else has found this, it certainly helps with a low specs pc flyability.