I know you guys use to block Japan and what not, but have you put any new restrictions lately? (past few months)
I use an Anonymous VPN. Whenever I connect through any server outside Japan, Danbooru is nice and speedy. But as soon as I disconnect some images and pages run painfully slow. This wouldn't be too much of an issue if Pixiv wasn't painfully slow when I VPN outside Japan, haha. I have a 150 MB/s connection, so I know it's not me. I've been living in Japan for a long time and I don't remember having this problem until recently.
If this is like that for a reason, I understand. Just wanted to make sure it wasn't something turned on by mistake. Thanks!