feature: update default config setting for async.concurrency from 10->64 #3526
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This PR updates the default async.concurrency setting in Zarr from 10 to 64. We've repeatedly seen (example 1, example 2) that Zarr performs much better at larger concurrency settings and the default value of 10 was a hold over from the very early experiments with Zarr-Python 3.
I talked this over with @d-v-b and @normanrz here at the Zarr Summit and both were cool with the change 😎
TODO:
docs/user-guide/*.md
changes/