I don't know about anyone else, but my MacBook is slower with the new beta. It could just be that my computer is older, but it would be nice to see a fix to RAM accessibility.
Mac is slower
What is "RAM accessibility"?
I've noticed the same thing. I get the spinning rainbow a lot, in all apps. This morning my machine randomly close apps and froze on me. A reboot seemed to solve the issue. I'm wondering if the El Capitan has a memory leak somewhere.
I am not sure what is going on, but I have the same problem. A lot of spinning rainbows. Mail seems to be having trouble with iCloud and has crashed on me once. Safari has crashed on me serveral times.I sure the beta will become more stable on future updates.
It's an early developer-access beta. It's very unlikely that anything has been built will full/standard compiler optimisations.