[causi]

Vivaldi puts Firefox Mobile to shame when it comes to speed.

[capableweb]

Unfortunately, Vivaldi is not FOSS which makes it a non-starter for many.

[Operative0198]

Brave is FOSS and fills the gap (if you can find all the crypto ads toggles hidden as hamburgers).

[robjan]

I find Brave slower than Chrome on my phone even on sites filled with ads.

[folmar]

Enable JavaScript JIT (disabled by default on Brave for something like a year) to trade some safety for performance.