I develop dozens of WP sites, and rarely have any trouble. But this is a new one on me: I had a friend ask me to work on his site. When I log into the backend, it's incredibly slow, taking minutes for any page to load, so it's awful working on it.
I simply assumed he had rotten hosting, and told him of my plight. But he can log into admin easily, make an edit in seconds, and hasn't had any problems. We've both tried many times and keep getting the same result. The hosting firm is a big one and pretty reputable.
When I'm just viewing the front end of his site, it's a bit slow, but does load fine. It's only in admin that I'm having the trouble. And on all the sites I work on, with a variety of hosts, this is the only one I have trouble with. I thought of some kind of cookie problem from working on so many WP sites, but that doesn't sound right either.
Any good ideas from you gurus out there? Thanks.