`Capture Rectangular Region` activation time is slow

So I’ve setup a shortcut on Capture Rectangular Region in spectacle. However, when I press it, it takes more than a second to launch it.

This is much slower than what I’ve grown to expect with ShareX/Gnome Screenshotting and MacOS screenshotting. Is this a known issue/expected?

Looks like it is a known issue, since i can’t include links, bug ID: 442876