If you want or need to do a speedtest but don't know how or where to do it, load this save and don't touch your mouse. Once your game is loaded, hit auto walk and start timer at the same time. After 2min38 you should hit a wall, if you hit the wall earlier, your game is running too fast. If it is running too fast, need to change settings such as switching from windowed mode to fullscreen or using higher settings. And do the test again.