Mac Mini M1 on Monterey (just about) broke home sharing to Apple TV

I like to watch my (mp4) video files on my living room tv via an Apple TV (3rd gen). I just swapped from Mac Mini M1 running Big Sur to a different Mac Mini M1 running Monterey (double the RAM and double the storage) and now using Apple TV to access media files is practically unusable. It often won't see files or is super slow and then runs out of buffer. Mac Mini is wired to network I see no network issues. I've tried rebooting everything (Mac Mini, Apple TV, router, etc.). I've tried turning off Home Sharing and turning it back on. I still have old Mac Mini and it still works fine. Any ideas on how to get Home Sharing working on new-to-me Mac Mini M1?