You can turn off some animations.
http://www.sevenforums.com/tutorials/99243-turn-off-all-unnecessary-animations.html
To prevent resizing and docking behavior (windows changing size)...
Might also be known as Aero Snap or Aero Shake.
http://www.pcworld.com/article/220222/Windows.html
http://www.sevenforums.com/tutorials/3069-aero-snap-turn-off.html
You can adjust other visual effects. And there is a list
in step 6, of things that might be worth playing with.
http://www.sevenforums.com/tutorials/1908-visual-effects-settings-change.html
*******
Set a System Restore point, or do a backup, before you start
fiddling around. If you don't like the mess you got yourself
into, the System Restore point you set, can return to the
"jerky" setup you have now.
Preventing resizing and docking would probably be enough.
Paul