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RFC 9000 recommends sending an ack for every second ack-eliciting packet received. This frequency is high enough to have a noticeable impact on performance. Follow the approach used by Google QUICHE: Ack every other packet for the first 100 packets, and then switch to acking every 10th packet. (Various other implementations also use a reduced ack frequency; see Custura et al., 2022.) For golang/go#58547 Change-Id: Idc7051cec23c279811030eb555bc49bb888d6795 Reviewed-on: https://go-review.googlesource.com/c/net/+/564476 Reviewed-by: Jonathan Amsterdam <jba@google.com> Auto-Submit: Damien Neil <dneil@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>