>The result was a new component we called <FastList>. The team intends to merge these together for cross-platform use and open source it for the community. With that we removed a lot of memory allocations and were down another 70-90ms of render time. We could now scroll the channel members list as fast as we wanted and it kept up admirably.

https://gist.github.com/vishnevskiy/f4ba74adf5cf1d269b860fab...

This is FastList Code. it's 100% javascript, and only imports are lodash, react, and react-native