lets share some findings with this cache backend enabled.
on a page with 100k+ nodes, prefetching the entire page took the same amount of time with the alternative cache backend of compressed_cache module as with the standard database backend. Application itself has a HA-Setup with database server and web server being on two different servers. Server A has db + web, Server B has db + web, one of them is flagged as master server for all requests coming in. master-master replication happening.
So that's a good find - it's not slower. But here's whats more important in my opinion:
Development after a couple of days:
Active
1.0
Documentation
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.