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So far I've run into a problem with Flagging. The fix described there seems to work. Something to consider for a patch release?
I've been testing 2.2 with jsConnect and I haven't noticed any problems yet.
In addition to
$Configuration['Garden']['Profile']['ShowActivities']= FALSE;, if you remove the "View Activity" permission from accounts, they won't be able to access the general Activity page either.
It's really no fun, but the library you are using exists in a newer version and if you look at that list: https://packagist.org/search/?q=markdown&search_query[query]=markdown&page=1 (michelf/php-markdown) it seems to be very popular. It also seems to be quite fast: http://kzykhys.com/blog/benchmarked-markdown-parsers-written-in-php/ Though parsedown (which has alreadybeen suggested by Bleistivt) is more than 3 times faster in that comparison.
Isn't it possible to simply update the used library or has it changed so much that it would require further customizing?
The library has already been upgraded on master. I've been using these changes and haven't had any problems. I believe @Linc is referring to the Vanilla-specific Markdown customizations, like spoilers and stuff that lets you write haikus.