Having same problem , my drivers are up to date all cpu, gpu running fine fps is up too 50 fps and down to 10 fps within a simple zoom in . fps clock is spinning up and down with the slightest mouse action , multiple divisions on screen slugging it out and its very laggy and fps 10. unplayable for me . I play warthunder on a steady 80 fps no lag Nvidia 970M card 12 gb ram to play with , I know its an old card but can still handle modern Apps with graphic settings tweaks , . I know its still in development so just putting it out there .