The next major release of OS X looms like some kind of mountain over some kind of park, but Yosemite isn't done yet. Today Apple released the final version of OS X 10.10, a bugfix update that comes almost three months after 10.10.3.
The first change in OS X 10.10.4 is to "networking reliability," which is likely a reference to the replacement of discoveryd, a new-but-flaky DNS service introduced in Yosemite. It has been replaced with what appears to be mDNSresponder, the service that handled discoveryd's tasks in previous versions of OS X.
Otherwise 10.10.4 fixes a list of minor problems with specific apps. The Migration Assistant has gotten more reliable, and "an issue that prevented certain external monitors from functioning properly" has been resolved. A bug that would delay outgoing messages in Mail has been fixed, and sites in Safari can no longer keep you from closing or switching away from the tab by generating multiple JavaScript alerts.
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