It seems it has been a long time since the MathJax has been updated on this site (probably MathJax 2.7 beta by @m0sa). So I was wondering if there is a plan to switch to newer version 3? (http://docs.mathjax.org/en/latest/upgrading/whats-new-3.0.html)
It should supposedly have better performance, unfortunately it is not a drop-in replacement (they changed it quite a lot). However since the version 2 will no longer be supported, this site should switch sooner or later.
Perhaps it could also fix some of the issues that have been reported but never fixed? (such as for example Plenty of [Math Processing Error]s before and after selecting duplicate in review queues or Redundant overlapping expressions in review queues when closing as duplicates).