Found this while looking into T70463, solves the high spinning times
mentioned in T70463#791026.
Sounds logical that iterating over an array to modify a single property
is faster than doing it in threads. But strangely, doing it for both
nodes and its components is still faster in threads here.
Gives extra speedup with a file mentioned in the report.
Reviewed By: brecht, mont29
Differential Revision: https://developer.blender.org/D6017
054ab92f8b