Searchlight framerate issue

[Bosje]

Hey kaleuns

I ran GWX 2.0 no problems, recently got gwx2.1
also running one of fubar's skins and torpedo damage, no other mods

the game runs fine, until i hit a target in a convoy, then the framerate drops dramatically. also i am now getting graphic issues: weird dos-like white and red ufos that seem to go with the searchlight, when i used the free camera to have a closer look, it slowed down to the point where i thought it might crash, the ship disappeared, all that was left were some weird ugly red and white triangles.

any ideas on which settings to tweak? particle density perhaps?

thanks