Currently we are not preferring the fast path and this starts to be a problem above 300 para validators. PoV recovery times distribution screenshot below. We need to dive deeper and investigate why it is so slow and switch to prefer the fast path (fetching from backers) until we improve it to be faster.

https://github.com/paritytech/polkadot/blob/master/node/service/src/overseer.rs#L227 should be using fast-path