Poor CDN performance from Telstra in Australia for IPv4, IPv6 OK

[simon29]

I am puzzled why ping times to the Cloudflare CDN for my domain (free tier) is over 200ms ping for IPv4 but less than 10ms for IPv6 (location: Melbourne Australia, ISP: Telstra).

Testing on https://cloudflare-test.judge.sh/

• IPv4: MIA (MIAMI INTERNATIONAL AIRPORT)
• IPv6: MEL (TULLAMARINE)

Over 200ms RTT to Cloudflare IP's from some Australian Carriers (Telstra and Optus)

Some of Australia’s telco providers are exorbitantly expensive. As a result we may choose to only provide / advertise particular ranges in certain peering scenarios and this may mean that for certain plan types peering may be to a datacenter elsewhere in APAC. The broadest coverage/peering would be available to Business and Enterprise plans. Even then, ultimately peering decisions are often the choice of the telco provider and some OZ telco providers make interesting choices on how to best s…

The above post may explain that it’s related to commercial peering arrangements, but why would this only apply to IPv4?
Noting other ISPs in Australia have quick responses on the IPv4 address.

IP addresses are
104.28.31.38
104.28.30.38
2606:4700:3032::681c:1e26
2606:4700:3036::681c:1f26

Good thing Telstra has wide support of IPv6 across fixed and mobile broadband.

[cs-cf]

Why wouldn’t it apply to IPv4?

@Over 200ms RTT to Cloudflare IP's from some Australian Carriers (Telstra and Optus) Performance

As a result we may choose to only provide / advertise particular ranges in certain peering scenarios and this may mean that for certain plan types peering may be to a datacenter elsewhere in APAC. The broadest coverage/peering would be available to Business and Enterprise plans.

Seems reasonable that we might choose different peering arrangements for different IP address ranges based on commercials.