Well, I have great internet connection and I'm not lagging at all on the device that I'm using (Kindle Fire HD). However, I may have misinterpreted what you meant. Correct me if I'm wrong.
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Lagging isn't always from the device, please go to speedtest.net and check your upload rate, if it's far too low, contact your ISP.
Other than that, the scripts on the doors seem fine as it triggers once touched without any checks.