It's not possible that GSX would *cause* stuttering.
We now have a feature to limit updates in GSX (which is optional), but if this is enabled, GSX should call the sim LESS frequently, opposite to the old versions, which were calling the sim at each frame, so they HAD the ability to possibly cause stuttering, especially in combination with other addons that do the same.
Which means:
- If you have the "Cap Simconnect updates" enabled (it's disabled by default), GSX will LIMIT itself to calling Simconnect no more than 30 times per second. This should REDUCE the risk of causing issues to the simulator.
- If you have the "Cap Simconnect updates" disabled, GSX will NOT limit itself, so it will connect to the sim at each frame, LIKE IT ALWAYS DID so, with this option disabled it's exactly the same as using the old version. This is the default.
Now, you said P3D stutters. Are you sure it's P3D that is stuttering and not, instead, the GSX vehicles themselves ( or the airplane during a Pushback ) ? Because, this would be a likely result IF you have the "Cap Simconnect updates" enabled (NOT default) AND you limited the fps: since GSX is limiting itself, IT (NOT the sim), will be less smooth, because this combination might cause missing some frames. In this situation, when GSX is pushing, you *think* the sim is stuttering, but only because the airplane is being moved by the GSX pushback truck, which might stutter itself.
However, this can only happen if you have the "Cap Simconnect updates" enabled (NOT default)
If you have the "Cap Simconnect updates" disabled (which is the default), GSX will work exactly like it always did, not limiting itself anymore so, IT will be as smooth as possible but, it can possibly cause issues to the sim IF your frame rate is very high. For example, if you had 60 fps, GSX would call the sim (for animations) at 60 fps, which would be a waste of resources, since all GSX animations are made at 30 fps, so it would be entirely useless to call the sim more frequently. THAT'S why we added that option to being with, but it was really useful only if your fps is much higher than 30 fps.
So, again:
- With the "Cap Simconnect updates" enabled (not default), GSX might be less smooth by itself (if your fps is lower than 30), but it will have LESS chance to cause issues to the sim
- With the "Cap Simconnect updates" disabled (default), GSX will be smoother, but it will have MORE chance to cause issues to the sim, but this is exactly like it always worked so, it's identical to having an older version, as far as updates are concerned.