High Latency in Pub/Sub Mode with Increasing Subscribers (Single Publisher, Hundreds of Subscribers)

May I ask why, in the pub/sub model, the latency increases as the number of subscribers increases? How can this issue be resolved? I’m trying to implement a single-writer, multi-reader setup (one publisher, hundreds of subscribers). Thank you very much!

No file, test, or entry point is named. Reproduce the reported single-publisher, hundreds-of-subscribers pub/sub setup and inspect the relevant performance path. Done means identifying the cause of the latency increase and documenting or implementing a verified resolution.

Written by the indexing model from the issue text.