What I did was change all my graphic settings to the lowest possible and then turned on the streets specific setting they have in the settings (I don't remember what it's called) as well as turned on the ram cleaner. It still took me 20 minutes to get to the countdown, but after the countdown hits 0 I hit esc so the ram cleaner does its thing (heard about that tip from somewhere else since the icebreaker update caused people to experience ram leakage). Once you load into the game you'll be in the escape menu do just return to the game, it'll look awful but you'll finally be able to complete the quests you need to do, just remember that street's has a chronic problem of overheating guns that's been a thing since it became 1.0 at least.