If you move child prims around in a link set, it used to be very expensive in terms of script time. Think animated prim animals.
Change the Physics Shape Type of all the child prims to None. It dramatically drops the script time.
"There never was an age in which so many people were able to write so badly." - Israel Zangwill, The Bachelors' Club
This is a Second Life® focused blog. Scripting, building and modeling, animating, and general foolishness lie within.