One restart will do the job, trust me... I do that every time I see the phone start to lag and after the off-on, it works like usual but of course I'll also force-quit unused apps that may be taking up background memory!

While I'm using an iPhone X, my wife is using the 8+... That one has a more familiar form factor, to be honest, with the home button and top-bottom cut-off screen, even if the size is kinda big and can't fit in a jeans pocket properly!

But because the X has a full top-bottom screen, it seems similar to the 8+, as a result... And yet nicer to hold because this phone is of a standard size!