I have a forum with many large threads (16k+ posts). After installing 2.3.0.beta10 +14, I notice a severe slowdown in large threads. The following actions take multiple seconds now:
- Entering thread
- Jumping inside thread
- Scrolling inside thread
When any of these requests is running, the corresponding unicorn process uses 100% of one CPU core/thread for the duration of the request.
In a currently active thread with ~19700 posts, these actions take ~4.5s each. Smaller threads take less time, but the amount of posts has no reliable relation to the amount of time—a thread with 15600 posts take 244ms while another thread (recently active) with 11000 posts takes 2.6s.
Regular users are unaffected by this issue. Moderators and administrators are affected.
Unfortunately, the forum is not publicly accessible.