Hello,

With the new FCM v1 http endpoints, support for batching was removed. The solution for large volume is now topics (but that leave you with generic messages) and using HTTP2 (just like APNs does) to benefit from multiplexing.

The current implementation uses requests, which doesn't support HTTP2, and uses a ThreadPool as a means of doing concurrent sends, but you still pay for the HTTP layer on each send.

Are there plan to use something like hyperx in the future to switch sendEach to, in order to benefit from http2 multiplexing.

Thanks in advance.