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Depsgraph: Avoid threading for trivial operations

Authored by Sergey Sharybin (sergey) on Tue, Oct 8, 11:37 AM.



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.

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