Ok. I added both properties over here in Chromium. It's really hard to tell since performance seems to be almost identical, but it seems very slightly less sl

Ok. I added both properties over here in Chromium. It's really hard to tell since performance seems to be almost identical, but it seems very slightly less sluggish using transform than using zoom (using test of standing on one place and pressing left/right and observing the pan, then unchecking zoom and checking transform). Basically same though. Any variation might be due to element jumping around page due to how those 2 attributes work (easily handled with positioning or transform). It'd be kinda surprising to me that Chromium would treat zoom differently than scale transform. I wonder if you just got the impression it was sluggish due to like jit warming up or something.