Why does xorg's cpu usage shoot up when using NVidia's driver?

Updated -

With many NVidia cards when using proprietary driver, xorg seems to freeze with high cpu usage. To fix this issue, add the below option to /etc/X11/xorg.conf under the Device section.

Option "UseEvents" "on"

Below shows how this change will look under the Device section.

Section "Device"
Identifie...

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