Screenshot

Link to plugin: https://www.assetstore.unity3d.com/en/#!/content/7827

I'm using the above plugin, "Gallery Screenshot", from the Asset Store to take a screen capture within my App and save it to the device's gallery. I've got it working all fine, however, when I push it to an Android device and hit the button to take the screenshot, it freezes for a couple of seconds. Does anyone know how I could speed this up and prevent it from happening?

For reference I've tested on a Hudl 2 and a Samsung Galaxy 4 Mini