I've done multiple tests on multiple settings in multiple game-modes with multiple classes.
You can't cook grenades.
You might FEEL like you've cooked them, but you haven't. I've literally held a frag grenade for 30 seconds, threw it, and still had to wait for the entire fuse before it exploded. Every person I've ever seen attempt to cook a grenade does the same thing: they pull the pin, hold for ~2-3 seconds, release... and the full fuse still has to burn. Is there a special button for it? If so, fuck that, it's stupid, fix it. If not, fuck that, it's stupid, fix it.
Between this and the still-present hit reg issues and poor bolt-action balancing are making it very hard for me to recommend this game to friends. I personally am considering refunding at this point; these are not the kinds of problems games should have this close to release.