new build, played demo, game stutters and framerate drops to half

ryzen 5 2600
gtx 1050 ti
16gb ram

been playing the demo with various settings and for the most part the game runs fine at 60fps, but usually two to three times a race the fps drops to zero, recovers to 30 then back to sixty, basically making the game unplayable, i want to buy it, but judging from the demo it plays like crap.

is my system just not good enough? trying to play at 1080/60hz

so nothing?