Kernel 6.8 boosts mobile Intel GPU significantly

Hi there, being encouraged by this article: https://www.zdnet.com/article/linux-kernel-6-8-offers-some-exciting-new-features-and-fixes-all-over/ I have installed the mainline kernel and indeed, spike performance in games is noticeable. I’m wondering what causes that as I’m using Intel HD620 (i5-8250u) so it doesn’t get Intel Xe support. i915 got some refactor or what? Are there any new settings I should take a look at?