Yea I’m looking into this. I’m guessing that what you’re seeing is the flash of the ajax loading gif? I noticed that too recently, and hadn’t before, so I’m going to find out why.
I started to create a ‘include on pages’ section in the Threepress admin as well, but I’m not sure that’s as important because Threepress is almost all js as opposed to php logic. So after the first load, it’s cached on other page visits and should be loading in milliseconds from your own browser. But a conditional loader would still be nice to have.
I got inspired and went ahead and did this today. You can find the new Global Settings tab in the Threepress menu item. I’ve tested it on 3 sites now; let me know any issues.