Miracast lag after update to OS 15.0.4

I'm running Windows 11 and my TV is Hisense Model 7Series -43. After the TV updated to OS 15.0.4, when I connect to it wirelessly (using Miracast) the name of the connection changed to rcast-[computer] when it had just been [computer], and it prompted me to allow the connection for the first time since I initially set it up. It took several minutes to finish the connection, and afterwards it was very pixelated and laggy. Sound is fine, but the picture quality is unwatchable. 

Nothing has changed on my computer (I have all system updates turned off by setting the network to "metered connection", so I know Microsoft didn't sneak anything in). My network speed is 612mb down, 495mb up, so I know it's not a slow connection. Other apps, including Plex (media server to TV) are working normally. It's only the direct stream from Windows 11 that doesn't work.