Steps to reproduce:
I noticed that scrolling wasn't as smooth as in Safari and I suspect it's caused by higher GPU usage.
I loaded up daringfireball.net with the same window sizes in both Safari and Orion so they have the same render area and started fast flick type scrolling up & down with trackpad.
Orion, OS version; hardware type:
M1 Macbook Air
Ventura 13.1 (22C65)
Orion:
Version 0.99.123-beta (WebKit 615.1.16.1)
Comparing it to Safari Tech Preview
Release 160 (Safari 16.4, WebKit 18615.1.14.3)
Image/Video:
Orion
Safari
Chrome
Edge
Please note that both the WindowServer and the other entry reports higher GPU usage compared to Safari (making the total difference even more significant, +30% in this case).
I did more than one test but I hope one screenshot is enough, you can try this too.