I installed new beta on my mid 2014 MBP. Update was slow but was done in about 30mnts or less. After reading several posts here and macrumors, I started installation and went to watch Mr. Bean on Prime. After one episode, I was walking past and noticed installation was complete and I could login.
So far ... Finder seems to be fast compared to previous beta. But, if I open Safari, right-click on any image on any website and try to save it, spinning beach ball starts rolling like in previous beta. This is very annoying.
As a practice, after installing any software, I run Disk Utility. Disk Utility said there is some corruption and suggested to fix it in recovery mode. In recovery mode, Disk Utility didn't find any issues. But, in normal mode, Disk Utliity still finds corruption.
Apart from this, I didn't notice any issues .. it has been less than an hour after installation. If I notice any issue, I will post here.