Dual screen setup: Laggy vertical screen +DisplayLinkUser Agent eating 100% CPU with a MBP 2019 Intel
I have 2 external monitor DELL AW2721D which are QHD (2x 2560x1440p). Both are plugged using HDMI. I can't close my MacBook Pro because you don't support clamshell on Intel Based MBP (sad). It's plugged on a StarTech Dual 4k universal docking station USB-C 100W.
One is horizontal, the other is vertical (90° rotation).
The horizontal screen position monitor runs smooth (moving windows around, moving cursor).
PROBLEM: the rotated monitor (90°) is extremely laggy. Even moving the mouse feels laggy.
I've noticed that DisplayLinkUser agent is eating up to 100% of the CPU when moving a windows in that monitor when it """only""" consumes 50% of the CPU on the horizontal setup monitor.
I'm running DisplayLink manager v1.2.0 and MacOS BigSur 11.1.
Intel MacBook Pro 2019 2,3 ghz Intel core i9, 32 Go RAM, and AMD Radeon Pro 5500M
I tried to lower refresh rate from 144Hz to 100hz and then 60hz on both screen, but it didn't help.
I've made a video of the problem. In the video, it seems like the "lag" on the vertical monitor is almost "ok" but I can confirm than in reality, it's WAY worse than captured. https://youtu.be/xR6ReH8hdsk
PS: Istat monitor does not say that my AMD Radeon Pro 5500M is currently in use like it does when I plug my macbook pro to another docking system. It says it's still using Intel UHD Graphic 630. I don't know if it's excepted or not.
PPS: The vertical monitor sometimes looses the connexion, goes black, and goes live again after 2seconds of black.
Jinwoo Wang commented
I bought a new Intel based Macbook Pro. and the mouse was lagging since i bought it.
I was disappointed for a while. I have set the Monitor to standard mode. it is working fine now.
I didn't even think that makes changes. Thank you.
It is a big issue. I need to use standard mode instead of rotating the external monitor.