I just added the Grishka-and-Anahata-as-approved-by-Max hosts file tweak.

Makes a big difference to loading time, much more than the router block did.

My guess is that DNS lookups for 2345 must be quite slow, either because they're away in China or because the attack is interfering.

(And having zapped one site that way, my natural query is "what else can I hit with that?" - maybe the BBC's treacle-slow script-hosting site might get it).