My site (1.8.2) is really struggling with load_user_capability() killing our performance. It seems to be linked to the execution of cron.php and to the viewing of Journal activities. Anyway, I just tried something crazy on our test server and truncated context_rel. Performance is super quick, but what are the implications? What breaks when context_rel is empty?
Hardware and performance
A Giant Query of 1.8 +
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