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我有用你这款docking，联三台显示器你不能设4K，看图：

xjcjq(rufeng)

(#15352220@0)
Last Updated: 2023-4-16
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枫下家园 / 电脑电信 / DELL XPS 15 laptop 通過DOCKING STATION 連三台顯示器（ two 2 4 inch + one 43 inch) , 運行一段時間后明顯變慢(鼠標移動速度，打開窗口速度）内置的顯卡是：Intel(R) UHD Graphics 630, NVIDA Geforce GTX 650.，有沒有什麽解決辦法？ -**🐩; 2023-4-16 (#15351809@0)

这是我找到的。 -troyd(老陈); 2023-4-16 {912} (#15351834@0) +1
The system is designed with the Intel GPU being the sole one connected to the internal or external display panels. The nVidia GPU isn't -- and cannot be made -- a primary GPU; it is solely a co-processor for the Intel GPU. It is controlled entirely by the video drivers.
There are systems where there's a hardware (or firmware) switch that allows the selection of the GPU at that level -- the new XPS 17 with the 2000-level GPUs is designed this way, as are many Alienware and other gaming systems, and some Precision mobile workstations. The XPS system you have is not engineered this way - it is entirely software controlled, and only the Intel GPU connects to the display devices.
The discrete GPU is not disabled other than when you do so by software settings, but neither can it directly send data to your display screen -- it must channel its output through the on-CPU Intel GPU.
https://www.dell.com/community/XPS/XPS-15-9570-Nvidia-GPU-two-external-monitors/td-p/7699244

那就是沒法解決了，除非換筆記本電腦。 -**🐩; 2023-4-16 (#15351852@0)
那个帖子大概齐意思是，xps 15 不是通过 disable intel gpu 的方式来强制使用独立 gpu，和楼主的问题可能无关。 -xmlhttprequest(build5381); 2023-4-16 (#15351907@0)

我用的就是 xps 15。我一开始也以为我可以象台式机那样指定哪台显示器用哪个 gpu，后来发现 xps 15 + usb-c hub 分配 gpu power 的方式不是原来我理解的方式。但那个（虽可能然而）多半不是引起楼主问题的主因。 -xmlhttprequest(build5381); 2023-4-16 (#15351946@0)

运行一段时间后变慢有些奇怪 -- 是 cpu / gpu 过热吗？风扇转得厉害吗？有没有 cpu / gpu intensive task 比如高清视频什么的？打开 task manager 看看是慢在什么地方了，cpu 还是 gpu，看看温度。 -xmlhttprequest(build5381); 2023-4-16 (#15351878@0)

兩個24寸顯示器是沒有問題，在多加一個出現了問題。 task manager 是 HIGH CPU usage, 有時（過一個晚上）， ctl + alt + delete 沒反應。 -**🐩; 2023-4-16 (#15351934@0)

cpu 过高有点儿奇怪。 -xmlhttprequest(build5381); 2023-4-16 {319} (#15351954@0)
具体是哪些 tasks 在吃 cpu？我现在用的就是 xps 15 带自身显示器 + usb-c hub + 两个外置显示器，没有 docking station。你的显示器分辨率和扫描是不是太高了？超过了 gpu 的能力？把分辨率和 refresh rate 降低先试一下。如果肯定是第三个显示器引起的，检查一下 nvidia control panel 里面 preferred graphics processor 是不是 Auto-select

去 Task manager 查一下谁在占cpu 和 mamory，看看能不能删 -w4b(w4b); 2023-4-16 (#15351893@0)
docking是什么牌子？三台显示器是怎么联的（DP？HDMI？）？分辨率设置是什么？ -xjcjq(rufeng); 2023-4-16 (#15352000@0)

Dell wd19 docking station; 24 -> hdmi, 24->Disp, 43-> disp. 43 inch monitor: 4k + 30hz -**🐩; 2023-4-16 (#15352182@0)