Curious question, why would IPv6 introduce additional latency?

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Having just researched this, I purchased the Dynalink AX3600 (DL-WRX36). While it’s not as simple as a drop in firmware reflash, it offered the best speed and performance for not significantly more effort; Wifi 6, USB 3.0 ports, and full MIMO antenna support.

I also considered the following:

• Buffalo WXR-5950AX12
• Linksys E8450 (5GHz ax only)
• Netgear WAX202
• Xiami AX9000

https://openwrt.org/toh/views/toh_available_16128_ax-wifi