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You should upgrade or use an alternative browser. So with my new M4 & Pro Minis I have a wide variety of connected monitors - all the way from 1080 for the base M4's earmarked to be used as appliances to the M4 Pros to be used interactively connected to TB3 docks (Belkin TB3 Pro docks) with 2x4K capability shifted over from retired Macs.

All of these have 2x 4K monitors connected via DisplayPort (both onboard and also the second connected via USB-C->DP adapter). What I've noticed on the Minis however is occasional "tearing" and flickering on both monitors. Looking around, it seems some people have the same issues on HDMI. Is this a dock problem or a Mini problem?