Lag detection does mean your site needs to have ok performance, but when testing it, I could play 10 of 10 youtube videos all at once without a false positive. During my tests, detection was still within the second I open dev tools, and successful if I go to the page with it already open. I tested this in chrome, firefox, and chromium. I also tested this on my somewhat slow website with tons of wordpress plugins installed (and the 10 videos at once test) without false positives.

Use Canada Post shipping with WooCommerce. Provides some of the premium features from other similar plugins for free.

Accurate Geolocation with HTML5, modern and advanced geographic location identification features!