Mouse pointer lag and HUD issues since new update

[BuckoA51]

Hi, since the 1.5 update I noticed a few problems on my system, I run the game on a ultrawide monitor at 5120x1440 which used to work reasonably well.

However I'm now getting quite bad mouse pointer lag in the game, enough to cause the game to stutter if I try and walk and move the mouse at the same time.

also, the HUD elements don't always appear at the right of the screen but instead over the terrain. This can be seen on any screen where the screen is filled horizontally.

My full specs:-

Processor AMD Ryzen 9 5900X 12-Core Processor, 4301 Mhz, 12 Cores
BaseBoard Product ROG CROSSHAIR VIII HERO
Installed Physical Memory (RAM) 32.0 GB
Nvidia/EVGA Geforce GTX 1080ti
Samsung LC49RG90 5120x1440 @ 100hz (Gysnc/freesync on)
Microsoft Windows 10 Pro Version 10.0.19042 Build 19042

[BuckoA51]

Additionally to the above, I just found that game elements that appear to the right of the HUD can no longer be interacted with, rendering the game unplayable in ultra-wide resolutions now :(

[BuckoA51]

Ok, the above issue can be fixed by changing UI scale to 125%. The cursor lag is still annoying though.

[BuckoA51]

All right I think I've solved this. It was two things:-

1) VSync - despite <vsyncEnabled>false</vsyncEnabled> being set in my startup_preferences, the game was still setting it to on. Stardew Valley is locked to 60fps so you either need to turn your refresh down to match or use gsync/freesync with vsync off if you have a monitor that refreshes above 60hz.

2) DisplayFusion - If you're running an ultrawide monitor chances are you're using this tool. Either shut it down totally before you launch the game or add compatibility settings in DisplayFusion (for Stardew Valley.exe and StardewModdingAPI.exe if you use it). Basically just disable everything for Stardew Valley in DF and you should be fine.

Hope that helps someone else.