What does Kiwi do different? The water appears to work well on Brave.

5 year old low end Motorola Android with Firefox and ublock. Smooth as a baby's bottom. Genuinely surprised!

Kiwi is deprecated by the way, use Firefox or just use Chrome which is what Kiwi was anyway.

Some features of Kiwi were merged to Edge, which means it now supports extensions (any extension if using developer options in Canary)