Safari is utter rubbish. Google search links still don't work a lot of the time. Many apps take forever to start. The fb app just goes to a black screen. SMTP server changed (!), short cuts stopped working, sms relay took an hour to get working after turning off and turning on all manner of settings to get this silly code to show up. You'd think it would have been as easy as just flipping iMessage on.
The first app I tried loaded quickly but it's been even more laggy than normal for the rest of the evening. Hopefully it's just doing some housekeeping and it will be a bit better tomorrow.