Huh, weird. I remember this happening last year when I got the iPhone X. Turning off the Apple Pay double-click fixed it for me.
However, now I have enabled it on the iPhone XS. Trying both side-by-side, there is no difference. And no delay as far as I can see.
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That’s weird. Mine is on and still no delay. There’s no difference even when I turn that option off or on.