This is a public beta/preview of the soon-to-be-released 4.0.17 update. There are a lot of small fixes and changes and so I'm actually releasing a beta. This is not available via the built-in updater, even if you have "Also check for betas" enabled. This saves me a ton of time -- it task about as long to publish a beta that way as it does to publish a regular release.
Here are the changes, which aren't sorted very well (like by importance/relevance):
Fixed very slow perf