Can high RF slow down updates?

[S G <sg...@gmail.com>]

Hi,

To support higher select-query-rates, we are planning to increase the
replication factor from 15 to 24.
Will this put too much load on the leader nodes? since each update now has
to be propagated to 24 replica nodes.
Each node is on a different IP but in the same availability region within a
data-center.

So if 100 update requests are coming per second, will it result in RF*100 =
2400 http requests originating per second from the leader? Is there any
async-IO happening for all these requests or a separate thread is launched
for each replica-update?

Thanks
SG