They don't have much grunt for sure. Zero 2 might fare better but still likely be quite slow. You might get further improvements by ditching chromium for something lighter.
Cheers. I tried exactly the same thing with a 3B I had spare and that worked fine so I suspect it's down to the pi zero.
I'm guessing it's impossible to buy a zero 2 so need to work out whether a 3b will fit in the gap I have. Will need to find a short gpio cable from somewhere.
They don't have much grunt for sure. Zero 2 might fare better but still likely be quite slow. You might get further improvements by ditching chromium for something lighter.
Here's old chat on the subject: https://forums.raspberrypi.com/viewtopic.php?t=192868