[Matthias247]

If I understand the possible culprit commit (https://github.com/golang/go/commit/faf882d1d427e8c8a9a1be00...) correctly then real world applications could still be faster than with the older versions on average. E.g. if a request handler would start a database request and forward it's CancellationToken (context.Done) to the database call both might be immediatly stopped with the new logic and the resources can be used for handling new requests. If in the old version the cancellation did not work properly the database request might have needed to run to completion before anything else could be done.