I use an iPhone 6S and I don’t doubt an X is fractionally quicker in performance but then again my iPhone isn’t laggy or slow in the first place. There is no concern on my part where I feel I need to get a quicker iPhone and that’s the point I was making.Which is your current iPhone? I'm talking about optimized performance, I highly doubt an iPhone 7 has the same performance as the 8/X. 8/10 Apps on the iPhone X are already optimized, especially the ones most users use on a daily basis.