It seems to be fine on my end. I normally use Brave but I am typing this on Firefox as a test.
If you are using a VPN it may be partially blocked for whatever reason on Cloudflares end.
A thing to note though is that according to their
You must be registered to see links
page there seems to be a lot of re-routed servers at the moment.
EDIT: It's being slow for me too now. I am not seeing Cloudflare errors though.