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nothing short of amazing that folks here accept the fixes as if they are worth doing!

opening Displays, picking Default, switching to something else, then picking something from Scaled------and this is a fix for your mouse lag????

Why is this acceptable? Bluntly, it doesn't fix this issue for me; and if it did, I would be just as primed to write this same post.

this - is - ********.

this is not how gadget ecosystems are supposed to work. broke-by-default is ONLY a 'thing' in the mac community.

it's ridic.

my cable is display port. it works phenomenally with my windows gaming rig for 144hz gaming.

when i try to throw it to my macbook pro with the CableMatters hub? oh no. no go. mouse is gonna be 1 update-per-second my dude. at best.

again--this is ... acceptable? we are looking for workarounds by way of by-consequence clickety clack in the Displays menu?

at a bare minimum we should admit that life in the Mac community is an exercise in esoteric dumb****ery.

passing around "wisdom" about how to fix quandaries like this is a joke. and hey, my sitch is not qualified for your genius "fixes" discovered thus far.

why th are we even doing this.
 
nothing short of amazing that folks here accept the fixes as if they are worth doing!

opening Displays, picking Default, switching to something else, then picking something from Scaled------and this is a fix for your mouse lag????

Why is this acceptable? Bluntly, it doesn't fix this issue for me; and if it did, I would be just as primed to write this same post.

this - is - ********.

this is not how gadget ecosystems are supposed to work. broke-by-default is ONLY a 'thing' in the mac community.

it's ridic.

my cable is display port. it works phenomenally with my windows gaming rig for 144hz gaming.

when i try to throw it to my macbook pro with the CableMatters hub? oh no. no go. mouse is gonna be 1 update-per-second my dude. at best.

again--this is ... acceptable? we are looking for workarounds by way of by-consequence clickety clack in the Displays menu?

at a bare minimum we should admit that life in the Mac community is an exercise in esoteric dumb****ery.

passing around "wisdom" about how to fix quandaries like this is a joke. and hey, my sitch is not qualified for your genius "fixes" discovered thus far.

why th are we even doing this.
haha. i've been censored. welllllllll, for those who have a quality cable that they can independently verify is not the issue, and a hub that has always been worth a damn, and didn't get lucky with the stupid System Preferences -> Displays -> 'Pick default, then something else, then whatever-you-want" *solution*... let me say: you are right to feel like this is a joke of an ecosystem. Guess what. Microsoft outdid you, Apple.
 
Thank to the thread I found the problem.

For me it was that one of the Scaled Resolutions I picked for my external monitor did not work without lag.

I don't understand why, but changing the resolution to the smaller text (more real estate) option did the trick for me.
 
Hello all - I have the same problem but adding a Dell U2720Q (4k) to a Late 2015 27inch iMac (maxed out GPS and 32gb ram). Mouse lags only on the Dell. Tried different resolutions and choose "fast" for refresh rate on the Dell menu. Connected to my iMac's Thunderbolt 2 port, to a HDMI-Thunderbolt adapter, then to HDMI on the Dell. Link to my adapter below. Any help appreciated!

 
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