I doubt about your computer issue, but try these steps
Press ESC > advanced > debug setting > change it to #6734 Graphics
Press ESC > advanced > Memory > make it max
Press ESC > Audio > Radio Volume > Make it 0%
Open /settings (in-game) and turn off all shaders also remove any car/gun mods from /gunmods /carmods
Open /settings (in-game) set max FPS value=60
Open /settings (in-game) set far clip to default
Press ESC > Video > Make your settings like this picture.