Early tests of frame rate switching in Android 12 on Chromecast with Google TV have found that the feature needs work, and app support.
How to Match Content Frame Rate & Resolution on Chromecast with Google TV (Fast Method)
Google Chromecast - Streaming Device with HDMI Cable - Stream Shows, Music, Photos, and Sports from Your Phone to Your TV : Electronics
Google Chromecast with Google TV (4K) (Snow) GA01919-US B&H
Everything new in Android 12 on Chromecast with Google TV
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Chromecast with Google TV (HD) - JB Hi-Fi
Just got my Chromecast with Google TV ethernet adapter today : r/Chromecast
Chromecast With Google TV Review
Google Chromecast with Google TV dongle with a new Google TV ecosystem and UI
Google releases Android 12 for TV with refresh rate switching, 4K user interface - FlatpanelsHD
How to Match Content Frame Rate & Resolution on Chromecast with Google TV (Fast Method)
Google is reportedly planning to launch a new Chromecast with Google TV - FlatpanelsHD
Chromecast with Google TV (4K vs. HD) Review: Among the Best
Chromecast with Google TV HD Review: Raising the Bar - CNET
Chromecast with Google TV Bootloader Unlock Released! : r/Android