‘QuickSiri’ allows you to launch Siri in full screen mode from the first launch. Normally when you launch Siri it doesn’t open up in full screen, instead it opens up 1/4 of the screen and when it’s searching or responding it opens in full screen mode. With QuickSiri it launches in full screen mode from the beginning.
Supposedly it “makes Siri load a lot faster and removes the glitch/lag that appears on older devices running Spire”, but based on my observations and tests, I don’t think it does. No new icon is added to your homescreen, nor is there anything to configure. Check out the video of QuickSiri below.