MY SETUP: I'm using the Larry theme on Debian buster. Roundcube was
installed with debian's package system. The package reports a roundcube
core of 1.3.16+dfsg.1-1~deb10u1. I'm using dovecot. Roundcube is running
on the same machine as the mailstore.
THE PROBLEM: When I perform a search query across all folders, it takes
about 10 seconds for any emails to get returned. This is better than the
40 seconds it takes with dovecot's solr plugins turned off, but still
pretty bad.
Queries with more results are taking longer. So a search result with 500
results could take 10 seconds while a query with 10 results takes just a
few seconds. If there are no results, the search terminates almost
instantly in roundcube.
THE QUESTION: How do I find the bottleneck?
I've ruled out solr as the problem because when I run a query against
solr running on a remote machine from the command line, I'm getting
results returned in less than 1/2 a second.
When I run a query using telnet directly over imap on a single folder,
search results are taking about 3 or 4 seconds, which indicates that
IMAP/dovecot may be where the bottleneck is.
So I'm leaning toward thinking roundcube is not the culprit so this post
may be a bit off topic but I'd like to know what kind of search speeds
others are seeing and hoping someone can help point me in the right
direction so I can nail this problem.
Thanks so much!
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