Out of interest, what hardware do you have? I had a Samsung S7, and the difference between Chrome and FF was minimal (Chrome was slightly faster, but only just). That's quite an old device, but I wonder if somehow it being a high-end device when it was new still counts for something...?
Cat S52. Although a 6502 managed to respond immediately to input 47 years ago, so I don't understand how a modern processor could struggle with this today.
