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## Using Helper Threads

Hiero and HieroPlayer also include two additional helper thread settings dedicated to OpenEXR and ARRI files. These helper threads assist the reader threads to improve performance for .exr and .ari files.

You can change the number of available helpers using the up and down arrows, or by simply entering the number of required helpers in the fields provided under Preferences > Performance > Threads/Processes.

In general, the default setting 0 should automatically assign helper threads correctly. If, however, your project is .exr/.ari heavy you might consider increasing the number of helper threads.

Note: The application must be restarted to apply changes to the ARRI helper setting.