Version of OpenTTD

1.11 beta2 portable
1.11 RC1 portable

Expected result

Right click and mouse move smoothly pans main window

Actual result

Panning is extremely laggy both in window mode and in full screen mode when in playing with native screen resolution at 4K (3840 x 2160). Changing the screen resolution to e.g. FHD (1980 x 1080) in Game Settings results in smooth panning as expected.

Panning worked/works flawlessly in 1.11 beta1 on same PC.

Steps to reproduce

Start OpenTTD 1.11 beta2 or RC1 (portable version, did not try installer version)
New game with default settings
Pan -> window pan is stuttering / laggy
Change screen resolution to 1980 x 1080 -> panning works smoothly
Change screen resolution to 3840 x 2160 -> laggy panning