Mouse Input investigation

[Calypto]

It's an engine-level issue. It happens across all UE4 games.

[ison111]

Just wanted to report back after building a new PC.
On my new machine the mouse input is absolutely perfect and crisp as can be. There's no feeling of any delay.

So this definitely confirms to me that it wasn't just my imagination. The difference is night and day.
And it also seems to imply it might be a hardware or driver issue.

Both machines were running GNU/Linux.
The old one had an NVidia GTX 760 and tested with both open source and proprietary drivers.
The new machine uses a Radeon RX 480 with open source drivers.