What's up with the slow webpage lately?

Two times over the past couple weeks, I've tried logging into my dynadot domain to manage my DNS records and the website has been extremely slow.

Not wifi issues on my end either. Both times I've tested my speeds and they're totally fine. Swapped dns to cloudflare and google, nothing wrong with any other website.

Looks like some page upgrades or something? But really annoying when it's happening midday during business hours.