Serious lag with High Refresh Rate on OP 10 Pro - are there any fixes?

So I just got the OnePlus 10 Pro and it’s great overall… apart from the terrible lag with High Refresh Rate turned on.

The touch responsivness, scrolling, everything feels badly wrong: really laggy and as if I’m moving through tar or something. If I set it to Standard Refresh Rate, it's uber fast and responsive; perfect. Note that this is true irrespective of screen resolution.

For reference, I have an S20+ which is what I was upgrading from and its high Refresh rate has virtually no lag at all :(

Is there any developer setting or… well, anything I can do to address this show-stopper? Part of the reason I chose the OP 10 Pro was because it had High/Variable refresh rate.

Thanks 🙏