You have no evidence to support this. Performance sucks in other countries because product leadership with their hands on the wheel of the company never prioritizes "unsexy" investments in performance and infrastructure work (same as the new guy btw). That is exactly what Eric was advocating in his thread.
Also 1000 RPC's are a very valid performance bottleneck, 1000 * latency caused by serde+ network can compounds easily based on data locality + container network orchestration, no data was provided otherwise even when asked for.
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.