What's your specs?
It's pretty rare that Cemu crash after the first race.
Here's mine finishing the entire cup(with video speed up)
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BTW. I did realized that Mario Kart 8 can save data.
I can see my recent ghost racing on GBAMario Circuit.
This is my PC for gaming and for emulators:
CPU: Core i7 6700K (no OC)
MB: Asus Maximus VIII Hero
VGA: 2x Asus Strix GTX 980Ti
RAM: G.Skill Ripjaws V 64GB DDR4 (3733MHz)
PSU: EVGA SuperNOVA 1600W