No, i have tried all versions and currently have the public version. I have given up on developer betas already, I don't trust them anymore. But I expected public OS to work as expected.
So no, the developer beta is not the cause. It happens to me and a lot of my "normal" friends who just upgraded their iOS because it kept bothering them with push notification to upgrade.
If you mean one of the developer betas then that's the cause of ... > [apps take a long time to load]