A Facebook application programming interface called isInputPending will be available in Chrome 87 and may help speed up content loading.
The isInputPending API started as an origin trail in 2019 and after feedback Facebook updated. Now the API is available in the Chromium project. Facebook and Chrome engineers worked to move the API through the pipeline.
Today, web sites are making a tradeoff between loading content as quickly as possible by doing the work all at once or chunking up small blocks to be more responsive.
Here’s the diagram of how the API works as well as the Github repository.