I've been using nglide with both Need for Speed 3 and 4, and it seems to work well for the most part. However, these games run at an odd refresh rate of 64Hz, so there is a persistent stutter (even though the frame rate is stable) at typical monitor refresh rates. I have a 170hz Freesync monitor, but that is not able to solve the stuttering problem, even though Freesync appears to be activated. I've even tried setting a custom resolution with a fixed refresh rate of 64hz and that also does not work.
Is there something that could be added to nglide to solve this problem? Thanks.