Mention performance improvement to Set and Map in Release Notes (#10425)
Mention performance improvement to Set and Map in Release Notes (#10425)

* Mention performance improvement to Set and Map in Release Notes

Mention performance improvement to Set and Map in Release Notes
see https://twitter.com/buybackoff/status/1326530575902011392

* Avoid superlatives

Co-authored-by: Phillip Carter <9dbe5f93010714d7e119b0cd422a92e83ced1eea@fastmail.com>

Co-authored-by: Phillip Carter <9dbe5f93010714d7e119b0cd422a92e83ced1eea@fastmail.com>
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