Poor UI performance + misbehavior with high resolutions

This is encountered with a 27" 4K monitor, set to 150% scaling in Windows. Yes, I know that it's not exactly ideal to be using 4K if I have to scale it anyway, but it's borrowed while I replace my main monitor.

The vitals HUD is clipping the left edge of the screen, and is not properly scaled for the screen resolution:

The poor scaling applies to all other custom UIs, too. The GTA built-in UI remains large, perhaps too large, whereas the custom UIs are almost unreadable in some cases.