Another data point: several users have reported that a cold startup of the firefox snap (just after booting the machine) on Ubuntu 22.04 in a Wayland session is significantly faster when using the beta channel than with the candidate channel. The only meaningful difference between the two is that the snap in the candidate channel forces the use of XWayland, whereas beta makes use of native Wayland support.
Another data point: several users have reported that a cold startup of the firefox snap (just after booting the machine) on Ubuntu 22.04 in a Wayland session is significantly faster when using the beta channel than with the candidate channel. The only meaningful difference between the two is that the snap in the candidate channel forces the use of XWayland, whereas beta makes use of native Wayland support.