Game keeps freezing while trying to load into world, Blizzard tech support hasn't helped much.

I've actually tried DDU before I had decided to replace most of my hardware. I ran it a few times, the last of those attempts being done in safe mode just to be sure. I'm starting to think that the issue may be related to too much data transferring over my network. If I log into WoW, load into a server, and spam my keyboard and mouse inputs into the game client, more often than not I'll see the hang up occur. The client doesn't crash or freeze and the sound of the game world still plays, I just can't get past the screen as it's frozen. I've noticed that my cursor will also have an hourglass icon during this period, I have no idea how to diagnose that as nothing suspicious is showing up in Task Manager. I've also noticed that this will occur much more frequently whenever I'm in a Discord call or watching a video on Youtube or Twitch. I've already changed out my Ethernet cable, troubleshooted my connection with my ISP, and changed out the modem, nothing helped.

Anyways, I'll try out the DDU now that I've updated most of my hardware. If anything changes, I'll be sure to provide updates.