branch 2.4 on prod

[Deniss Gaplevsky]

hello,

i have a question to Brong as main powering force of cyrus development.

I know cyrus is used at fastmail/opera for serving a lot of users.

But stable branch 2.4 has a lot of performance related issues - like
statuscache usage, grisly index lookups, etc - fixed in 2.5 which is not
stable and not available as tarballs so far.

Im curious what is the cyrus branch/version in use at Fastmail/Opera
currently ? How well it is compatible to cyrus 2.4 branch ?

Best,
 Deniss