This is a ticket to backport of bits of change 4605 to release branches:

4605.   [performance]   Improve performance for delegation heavy answers
                        and also general query performance. Removes the
                        acache feature that didn't significantly improve
                        performance. Adds a glue cache. Removes
                        additional-from-cache and additional-from-auth
                        features. Enables minimal-responses by
                        default. Improves performance of compression
                        code, owner case restoration, hash function,
                        etc. Uses inline buffer implementation by
                        default. Many other performance changes and fixes.
                        [RT #44029]

The bits to be backported will be decided when preparing the branch,
with the requirement that there must be no behavioral changes in
existing releaes branches. The backport branch(es) should be put to
review to confirm this.

		Mukund