Will it support 4K res (3840x2160) monitor? Specs above say it supports resolutions up to 2560 x 1600. I called Tripp Lite and was assured it supported 4K.

Yes. I own an LG 34UB88-P 4K monitor and am typing this message on it now, using the Tripp Lite. My setup switches between a Dell XPS 8900 w/ GTX1060 graphics and a Lenovo T480s laptop. Dell runs perfectly at full 3840x2160 resolution.

can it display 144hz monitors?

Yes, but you'll need good (and preferably short) cables for it to work reliably.

Questions & Answers: Tripp Lite 2-Port DisplayPort 1.2 KVM Switch with Audio, Cables and USB Peripheral Sharing (B004-DP2UA2-K)

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Tripp Lite 2-Port DisplayPort 1.2 KVM Switch with Audio, Cables and USB Peripheral Sharing (B004-DP2UA2-K)

Control 4 DisplayPort computers using one DisplayPort monitor, USB keyboard and USB mouse
Connect USB 3.0 peripherals, such as hard drives and webcams, and share them between computers
Switch among computers via front buttons or keyboard hotkeys
Supports digital video resolutions up to 2560 x 1600 & USB 3.0 data transfer rates up to 5 Gbps
Includes all necessary DisplayPort, USB 3.0 and audio cables

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