BetterTouchTool has some relations on the issue
I found that the delay happens when both the DisplayLink manager and BetterTouchTool are running.
If I quit one of them, the delay disappears.
The delay happens even if the BetterTouchTool has no settings right after installation, as well as selecting the [Disable BetterTouchTool For All Apps] option.
But the delay doesn't happen on the Test user account on my Mac.
So... it might be a complicated situation only for me.
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