That random update fixed it.

Reinstalled it and launched it without mods and the framerate in the editor is very good now. still crashes though so no progress.

Reinstalling Insurgency fixed the framerate stuff. Im now reinstalling Arma again which means also redownloading all the mods. If its not working then ill be ready to give it up...

For some time now i also have troubles with the game Insurgency... Seems like since it got the BattleEye Update... The Framerate drops all the time. I noticed the same in the ArmA 3 AND even the ArmA 2 editor. Dont know if its related but ill try to get BattleEye fixed or something or nothing.

Ok i unloaded all the mods and repaired every single one just to be sure... Except the handful of mods from Armaholic or elsewhere but they are not listed with the culprits. After repairing the mod i loaded it and did so with all the mods. Then i started the game as always and it still crashes.

Since it still doesnt work after I tried some other things here and there I did the troubleshooting and here is the report I saved:

Thanks for the ideas so far!
I updated my graphics and deleted my profile. Both didnt fix it. It still crashes when i try to save/open. I played multiplayer recently on a server and it works fine. No troubles. I just cant save or load missions in the editor...