Crashed in approx 60% of games in 13 hours playtime. After changing to borderless fullscreen via in-game menu I've had zero crashes. Played 4 hours after changing.
Rig MSI GE70
CPU: Intel core i7 -4700MQ Processor
GPU: Nvidia Geforce GTX 765M / 2GB GDDR5
Memory: DDRIII(L) 8GB
HDD: 1TB+128GB SSD (SUPER RAID)
Game and Steam installed on SSD, all settings on minimum.
Still stuttering -> Devs are of course working on optimization
Source from Insurgency: Sandstorm Developer Q&A! posted on youtube sept 24, 2018