Does macOS support 144hz external displays

Phynomix wrote:

I am thinking of getting 2 1440p 144hz displays for my new MacBook pro. I can't find if this is supported.

You do not say what exact MacBook Pro this is?

Use multiple displays with your Mac

https://support.apple.com/guide/mac-help/use-multiple-displays-mchl7c7ebe08/mac

Using 4K displays, 5K displays, and Ultra HD TVs with your Mac - Apple Support
 https://support.apple.com/en-us/HT206587

Use the LG UltraFine 5K Display with your Mac or iPad Pro https://support.apple.com/en-us/HT210205

32-inch Retina 6K display https://www.apple.com/pro-display-xdr/

No one here works for Apple so this is not a confirmation but the Intel Iris Plus Graphics 645 integrated graphics does support 1440x900, the refresh should be up to the monitor but depending on what you're doing it could run a bit hotter than normal use w/o the displays.

13.3‑inch (diagonal) LED-backlit display with IPS technology; 2560‑by‑1600 native resolution at 227 pixels per inch with support for millions of colors

Supported scaled resolutions:

• 1680 by 1050
• 1440 by 900
• 1024 by 640

500 nits brightness

Wide color (P3)

True Tone technology