Change 98511 had a related patch set uploaded by Daniel Kinzler:
(bug 57746) Allow entity pages to use parser cache

https://gerrit.wikimedia.org/r/98511

Change 98511 merged by jenkins-bot:
(bug 57746) Allow entity pages to use parser cache

https://gerrit.wikimedia.org/r/98511

This was reverted on the deployment branch, due to several issues:

a) old parser cache "pointer" entries in the cache causing entity content in random languages to be shown. Should be solvable by bumping wgCacheEpoch when deploying.

b) The term box ("in other languages" section) is user-specific and can not be cached, see bug 58342

c) EntityView uses the language from the context object, instead of the language given by the parser options for generating output. See 58344

(In reply to Daniel Kinzler from comment #0)

MediaWiki usually forces the parser cache key for anonymous visitors to
'canonical'. This should be overwritten for Wikibase, and a cache key should
be generated based on the user preferences, just like for logged in users.

Nice. Will this bring us any closer to having ULS language selection enabled for anonymous users (bug 56464 and friends)? This area would greatly use some atomic bug reports for each component of the issue...

(In reply to Nemo from comment #4)

Nice. Will this bring us any closer to having ULS language selection enabled
for anonymous users (bug 56464 and friends)?

Nope. The problem is at front-end caching level.