Holly Tsarchon

I have been having a heck of a time lately moving around in SL. Is anyone else having this issue? Even the movement control arrows move really slow or get stuck often. Does anyone know the solution? Pretty much everywhere I go, my movements are choppy, I get stuck and I get the rainbow wheel (i use a mac), and sometimes I have to turn in a certain position just to be able to move at all. I have used SL's most updated viewer and tried Singularity as well, but it is the same thing with both viewers. Does anyone have a solution. I want to begin working inworld and right now it is impossible because I can barely move most of the time......note: I can move the best if I am turned away from a crowd or off to the side by myself. But even in deserted, empty sims I sometimes still have trouble moving. Has anyone else experienced this and what is the solution. This has been going on for the past 6 months. Before that I could move at top speed everywhere.

Can hardly move around in crowded places. What could be the problem?