Slight input latency - FLHDE/freelancer-hd-edition GitHub Wiki
If you find that there's a slight input latency when playing Freelancer: HD Edition, there are a few things you can do to lower that.
Use a different Graphics API
dgVoodoo, the default selected Graphics API, always adds a bit of input latency because it's a legacy DirectX wrapper. Try experimenting with the other options to see if that makes a difference.
Disable ReShade
We can't confirm this as of now, but we've heard from some players that ReShade adds input latency too. Therefore, disabling it may reduce input lag. Please note that the Vanilla Freelancer and Lighting Bug Fix graphics APIs don't support ReShade anyway.
Ensure VSync is not forced by GPU drivers
It's possible that the issue is not caused by the mod, but rather by your GPU drivers (NVIDIA, AMD, or Intel). Please check your GPU drivers to ensure that there isn't any forced VSync or FPS lock, because this can cause input lag.