Special:Search on Wikidata takes a very long time to load since Cirrus search was made default there. It seems to work reasonably fast when using it with a search string.
(reported on Wikidata's Project chat initially)
Version: unspecified
Severity: normal
How long and for what queries? I'm seeing times of ~800ms on both wikidata and itwiki for some simple two word queries. OTOH it looks like enwiki, which doesn't have cirrus, takes ~600ms for the same searches. Elasticsearch is reporting that its side of those queries takes ~30ms. I'll add my own timings to the request to measure round trip time and make sure Elasticsearch is being honest. Regardless of what that reports, I'll dig further once I have that data.
Without any query. This is when simply loading https://www.wikidata.org/wiki/Special:Search