iPv6 issue, slow downloads...

[tallytr]

With iPv6 enabled downloads are around 40% slower than with iPv4 only... why?
Measured on RT-AX86U router wired and connection to a Telus Fibre modem (NH20A) in 10G bridge mode on 1G internet plan.

Merlin: 3004.388.8_4

 

[dave14305]

The IPv6 speedtest server may be farther away than the IPv4 server, or the IPv6 server is overloaded. There’s really no way for us to tell you why. A lot can happen between the router and the destination.

Are the results consistent? Are you certain the tests are going to an IPv6 destination?

 

[tallytr]

The IPv6 speedtest server may be farther away than the IPv4 server, or the IPv6 server is overloaded. There’s really no way for us to tell you why. A lot can happen between the router and the destination.

Are the results consistent? Are you certain the tests are going to an IPv6 destination?

I have zero clue actually, all I know what I see on the router speed test page, are you saying do not worry, would you leave IPv6 enabled?

 

[dave14305]

I don’t mind IPv6. I always have it enabled. If the Speedtest results are not consistently poor, then it’s probably not related to IPv6 being enabled. A test run at 4PM might suffer compared to one run early in the morning. See if there’s a pattern. But don’t fret much about speed tests run on the router. Better to test from a wired client.

 

[tallytr]

OK, cool.
Tried again and used Speedtest on my PC (Ethernet connection to router) and the results look better, but slower compared to router menu speedtest.

iPv4 only:

with iPv6 enabled: