Mobile web apps are slow because of layers upon layers of leaky abstractions and algorithms at each layer that still have a lot of room to be optimized.
If you want a consistent 60 frames a second, you need to architect systems that complete the work that needs to render each frame within 16.6ms. If you can't complete all your computations within 16.6ms, you need to prioritize computations and spread them across frames.
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Mobile web apps are slow because of layers upon layers of leaky abstractions and algorithms at each layer that still have a lot of room to be optimized.
If you want a consistent 60 frames a second, you need to architect systems that complete the work that needs to render each frame within 16.6ms. If you can't complete all your computations within 16.6ms, you need to prioritize computations and spread them across frames.