On Realms, with a texture pack loaded, the realm is sometimes completely unplayable for some of my members. They'll hit 'escape' and the game will take 10-30 seconds just to pull up the menu, and moving? Impossible. I've tried toggling "Require Players to Accept resource packs to join", but that makes no difference.

Strangely, my roommate can access the server (with the texture pack) perfectly fine on my network, and another member who lives near us experiences some lag, but no where near as much as the other member who can't even exit the game.

It's not the member's computer because he's on a gaming computer. He's able to access the Realm perfectly fine with basic texture. It's not his network because when he did a speed test, he had a download of 190 mbps.

The member did DOWNLOAD the texture pack, so why is the Realm still having issues with it?