OpenVPN dco how to enable?

Installing and Using OpenWrt
41

With latest master snapshot (private build)

Pixel 5 <=OpenVPN-TCP(AES-128-GCM)=> R7800 <=> Speedtest server

Without DCO:   D/U ~ 60 Mbps / 50 Mbps
With DCO:   D/U ~ 90 Mbps / 60 Mbps

Pixel 5 <=OpenVPN-TCP(chacha20poly1305)=> R7800 <=> Speedtest server

Without DCO:   D/U ~  77 Mbps / 56 Mbps
With DCO:   D/U ~ 135 Mbps / 60 Mbps

Pixel 5 <=Strongswan(chacha20poly1305)=> R7800 <=> Speedtest server

D/U ~ 73 Mbps / 72 Mbps

Pixel 5 <=WireGuard(chacha20poly1305)=> R7800 <=> Speedtest server

D/U ~ 150 Mbps / 180 Mbps
42

My ER605v2 + OpenVPN with DCO + CHACHA20-POLY1305:

Download 48 Mbps / Upload 38 Mbps.