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I have a 32Gb M1 Pro as a work laptop and connecting a retina 4K external display is not a fun experience for me either. It was very surprising to see it fail to maintain 60fps in the OS’ own animations.

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That seems like something is wrong - if this is a known issue with such capable hardware I'd find that shocking

Are you using the built-in HDMI port, or a dongle? I had the same issue before switching off the dongle.

This is through USBC which also charges the laptop.

Is the connection handling HDMI natively, or via DisplayLink? I could definitely see performance issues being accentuated for DisplayLink.

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