mac 鼠标指针慢

接了外接的 usb 鼠标后，会出现拖动无力的情况

重置NVRAM 或 PRAM 之后，鼠标非常顺畅

OPTION+Command+P+R+POWER

Option-Command-P-R: Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery.

https://support.apple.com/en-us/HT201255

打开 System Report => 图像显示, 发现
UI Looks like: 2560 x 1440 @ 29.00Hz
想办法证它显示 4k 60Hz
下载 SwitchResX4.zip，选 2560x1440x60Hz 在 DELL U2720QM Display 效果最好