Not to defend any of the catastrophe of management that just happened but can't both be true? Eric does say in his tweets that a lot of time is spent waiting on the network. If that is because server side, the endpoint handling a request is spamming other backend services with 100s of RPC calls it would be slow. Now, why you would call out your android dev. on why your backend is not responding fast, I dunno.

That's client-side requests. Musk was talking about internal RPC calls to microservices needed to ultimately respond to the client-side requests.

If the internal arch is heavy on microservices and you're putting together, say, 50 tweets you're at 1000 RPC calls with just 20 per tweet. It's not inconceivable.

The developer puts the real number at 200.

RPC generally means server side calls, probably this https://twitter.github.io/finagle/, and XHR is not RPC.