After upgrading from 2.4 to 5.1.2, we can see a tremendous increase of response times in simple document gets (from java's get API over transport protocol).
Previously -with 2.4-, the response times were in the range of few millisecs (1-5), now there are responses above 1-2 seconds, but only a few. The median seems to be OK.
The slow query doc says that there is no slow query logging for exact gets, just indexing and searches.
So what's the preferred method of finding out why these get queries are slow?