[Gladsomebeast]

The CPU limiting factor with avatars is recomputing their mesh for each frame of animation. So to reduce this load:
>Use lower polygon avatars.
>Decrease the number of times the avatar's animation is recomputed with the avatar.updaterate() function.

Its best to use these two options on avatars that are further from the viewer.

You could also set avatar's updaterate to 0 when they are out of view. The viz.MainWindow.isCulled(avatar) returns True if the avater is out of view.

Don't know what it takes to get 100 animating avatars, but upgrading the CPU should improve performance.