WTF I CAN'T EXPORT ANY MOVIE!!!!!

[youtube.com/c/petersonsartgames]

What the hell is this crap!!!??? I am trying to make a speed drawing video for hours with this stupid software... I tried to cut by parts and renderize (export) them one by one ... But NOOO ti still so slow, freezes and crashes!!!!!
I have seen other people complaning with equal or worst problems!!!! If you don't solve this I will try all the ways to refund my money!!!!