Yes, the engineers (myself included) are working on it.
There is a handful of improvements still being tested internally. If I had to guess, the one most likely to affect your hub is improved event history management. We saw folks who updated to to 2.2.3 reporting much better response times after nightly cleanup job has run. So why not do a cleanup when hub starts and avoid sluggish response until overnight job? Hindsight 20/20...
Hopefully this fix will deal with the slow hub issue. We'll keep chipping away at the problem until it's no more.
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