Set prefetch mulitplier to 1 to improve performance of stores and qr Celery queues

[Ed McDonagh]

See the Celery docs.

Default is four, which could explain why tasks don't start concurrently when there are available workers, as one worker with a long running task may have grabbed the next three or four tasks too.

[Ed McDonagh]

Issue #330 was marked as a duplicate of this issue.

[Ed McDonagh]

This was fixed in 4fd7925 back in December 2015!

[Ed McDonagh]

Confirmed fixed #327 so added to changes/CHANGES

→ <<cset 7f7b18f25ed2>>