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I Checked your website to see if it's still lagging. Well, your website seems fine now, the page loads immediately.
If this kind of issue happens again, the reason might be an excessive overhead on your website's database. To optimize your database it will be helpful if you remove it.
Another problem could be because of some sort of caching issue that's preventing optimized page loading.
My choice would be PWA, because it can run on any device or OS and can work even when offline. Security features are amazing too since it is based on HTTPS which allows browser-to-server encryption.
The downside is that it has fast battery consumption because PWA requires more CPU usage.