Here’s a Second Life trick that shouldn’t work, but it does. If a sim loads extremely slowly for you after you teleport, open Preferences (CTRL P), go to Network, and kind of jiggle the Maximum Bandwidth slider.
The result is that it seems to unstick everything. Things load much faster afterwards. It’s as if all those prims and textures were clogging up the internet tubes and jiggling that handle kind of loosens them up enough to make them flow again. (I know that’s not actually what’s happening, but it’s an amusing image.)
I’d guess that this is a bug. Two bugs maybe. First, options in Preferences seem to apply themselves as soon as you click them, instead of waiting for OK or Apply. Second, things should load at top speed anyway, without the need to monkey with bandwidth.
Give it a try. It really works!