Found a problem with this build. I noticed that using Firefox, there is a higher cpu usage when running a video stream in 12 tabs with a local file. I didn't have this in 10240 stable.
Also, I lost bluetooth connectivity randomly a couple times when my Logitech bt keyboard/mouse quit working. It started working again when I plugged in my Logitech unifying receiver and then it happened a second time when I tried to play a Youtube video. Went to settings with a usb keyboard and they showed connected. So I unpaired and repaired them both after this happened twice.