Thanks for the heads up Phil. And yes- this is cropping up several times lately. I suspect a popular addon or two are ‘down’.
If the cp is slow all over AND it’s only happening for superadmins? Odds are very good the problem is due to a third party add-on doing a version check. They basically ‘phone home’ to see if there’s a new version and give you an update message if there is. The problem happens if ‘home’ does not answer. So they let the phone ring way too long- kinda like this metaphore. Eventually it gives up the ‘phone home’ attempt and processing continues as normal.
If your slowdown matches the superadm+all over cp pattern? Look for add-ons that show update messages. Or- NSM Addon Accessory. Remove/disable them. Well- preferably remove, as I don’t know how they are sending the update check. I’m fairly sure someone solved this issue by removing html_strip- which is just a plugin and I wouldn’t have thought it was checking.
But yes- seek out anything that tries to give you a ‘new version available’ message and disable that behavior.
And then- let me know back what you find!