I can assure you this is happening to your device as well.
Well, seeing as I have my device in my hand, I can assure you that you're wrong about that. I've followed your instructions, scrolling by swiping from the top right to bottom left. I did it slow, moderately fast, and then as fast as I can physically swipe diagonally, and then even reversed direction. I did this multiple times across four screens of icons and the search page. And I found no lag or stuttering, just like when I scroll the way I normally do.
I DID come to two conclusions though:
1. Scrolling the way you describe is probably the most awkward way for me to scroll icons on my home screen, because it takes a lot more physical effort to swipe diagonally and still get the same speed as swiping horizontally. Even if my iPhone 5 were lagging using this method (which it isn't, I assure you), it's something I probably never do, unless told to by someone, and even then it's tedious. I'm already annoyed with myself at the amount of time I've wasted on this.
2. Really? THIS is what you're going to fixate on? Something that hardly anyone has been able to reproduce, using an action that is quite awkward, and has a totally insignificant effect on anything? Even when the OCD wackos on here have already found plenty of other, arguably more significant things to obsess over?
I mean even on the noticeably bad scrolling on Android phones, I might find the lag kinda disappointing, but not something worth even mentioning as a gigantic defect, insisting that EVERYONE make a big deal about. Again, there are plenty of way-bigger deficiencies I could obsess over if I wanted to.
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