ETS5 locked to 30 FPS

I'm getting abysmal performance when using the app. Even gets tough to control when moving the cursor.

It seems that the display port is locked to a low framerate (feels like 30 FPS or less). I'm running it on a high-refresh rate monitor (240 Hz), so the difference is gigantic. My cursor makes leaps of sometimes hundreds of pixels at a time when moving around.

I've tried disabling Vsync through my GPU's settings, but that didn't make a difference.

Am I alone with this problem? Has anyone found a workaround? Would be greatly appreciated to share!

Thanks in advance!

Brecht