Safari WebExtension popover doesn't open smoothly

Hi,
There seems a noticeable delay when open Safari WebExtension popover. Even if the popover is a very simple html page, the popover actually delays about 1 second after I click the toolbar icon.
It is hard to share a gif or video clip here, but it is kind of obvious on Safari 14.0.2 (14610.3.7.1.10) on a MacOS Mojave 10.14.6 which I am testing.
Are you also seeing this issue?
Thank you
If you could please file feedback at https://feedbackassistant.apple.com and include a sample extension that reproduces this, that would be very helpful.

Thanks!
Thanks bweinstein, the feedback is created https://feedbackassistant.apple.com/feedback/8978683
Safari WebExtension popover doesn't open smoothly
 
 
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