Large amount of resource usage and delay when "joining world" for the first time after starting the game

Whenever I join a world for the first time after starting Minecraft, there is a large (as in - 1-2 minutes) delay after the "joining world" text shows. The Minecraft log only denotes that it was running about 13 seconds behind (266 ticks). Looking in task manager, I see 99% CPU usage, and eventually, Minecraft stops responding. It will start back up eventually, but apparently, this happens after the actual game starts (I was just slain by a spider before the game even loaded up). Looking at the log, it appears that my player logged in before any warnings were issued at all. I haven't had this kind of problem in any version other than the snapshots (it's in 20w47a as well). My CPU is Intel core i3 540 @ 3.07GHz 3.07 GHz (copied directly from the "System" section of the control panel). I'm running the latest version of Windows 10.