Andrew, one of the plugins I use, Royal Slider, returns a js error: 'jQuery is not defined,' on the wp-login.php page, but not within the admin area itself. Actually, there aren't any console errors within the admin area.
@songdogtech, Bluehost is hosting the site. Not on that particular server, but I have other WP sites (v 3.4.2) hosted with them and haven't had any severe latency issues now or in the past. I've contacted Blueshost on 3 separate occasions, and they give me the same feedback. They keep trying to push CloudFlare on me.
The time an admin page takes to load is random. On average it's 3 to 6 seconds, which is still a bit slow compared to WP 3.4.2, but acceptable. But, at times, more than usual it takes 12 seconds or longer.
According to this screenshot
is the time it took for me to go from "Media" to clicking on "Pages." Mind you, all I have is 10 pages total.
Then after that, from "Pages" to clicking on "Themes," it took 12 seconds.
Although, I have plugins active now, the problem has been the same, especially looking at the last screenshot. Any ideas?