I always run a beta of the latest macOS. In this case that is Mojave 10.14. The Beta 5 version was released today and I installed it immediately. It was quite large at around 3.2 GB. After the installation everything seems to be running great. It maintains it’s snappiness, things boot quickly. Of course, I am running it on an older Later 2012 iMac and on an older SSD, but it still is quick. Looking forward to Mojave when is is released this Fall, it is quite stable already.