This is the opposite of my experience on android. Firefox with uBlock Origin is the only way to get some sites to load in any reasonable timeframe. The difference can be measured in 10s of seconds, and is more noticeable with worse hardware.
Have you used it recently, or just years ago? It definitely used to be very slow, but since ~2 years ago it's very good, and my go to browser (my phone is not high end, by the way)