(ask) mobile dekstop dock with HDMI to tv fps problem

why when i use mobile dekstop dock with HDMI connect to tv only get 60 fps ?
but when i play without a tv i get 90 fps ? its because tv or mobile dekstop dock with tv only support 60 fps ?
Thank youuu hope someone know about it
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Comments
Yes, if your TV only supports 60 fps, then both phone and TV will be in 60 fps