Blogspot domains extremely slow on Xfinity DNS — fixed by Cloudflare DoH

Hello,

Over the past ~3 weeks I’ve noticed that Blogspot blogs (example: https://theuncarvedtest.blogspot.com/) are extremely slow or nearly unusable on my Xfinity connection.

Key findings from troubleshooting:

• Friends on other ISPs (non-Xfinity) can load the same blogs instantly.

• If I enable Secure DNS (DNS over HTTPS) in my browser and force queries to Cloudflare (1.1.1.1), the problem disappears immediately. Pages load fast.

• If I use Xfinity’s default DNS resolvers, the same pages are very slow.

• This issue happens across devices (Windows PC, phone, tablet) and persists even if I manually configure 1.1.1.1/8.8.8.8 at the router level, which suggests the Xfinity gateway/network may be intercepting standard DNS and forcing it through Comcast DNS.

Supporting details:

• nslookup using 1.1.1.1 returns instantly; the default (Xfinity DNS) is delayed.

• Traceroute to Blogspot content hosts looks normal, so the bottleneck appears to be DNS resolution, not routing.

• This began around [insert approximate date, e.g., late August 2025].

Request: Please escalate this to Xfinity’s DNS/network engineering team. It looks like Xfinity’s recursive resolvers are introducing latency for Blogspot/Google domains. Other users will be affected unless this is fixed at the resolver level.

Thank you,
Andrew
Xfinity customer in Oakland, CA