Sup, found a mostly all fix for it, under graphics:
-keep it in windowed mode
-keep 3D resolution at 100%
-adjust the rest as you see fit, mine are (in sequence) medium - medium - low - ultra - high - low
on a Nvidia EVGA 1070, i7-6700, 16GB Ram, nothing overclocking.
i got it working to about a 95% success rate in the starting area, only stuttering would happen against sprats.
Ta.