All I know is that Renpy animations played well on my old computer before Renpy 8 ... when 8 started being introduced, those same animations suddenly became lag quagmires. And LoF froze completely trying to play the post-credit u4ia trailer.
When my computer then started showing signs due to recent power outages that it wasn't long for this world, I decided it was time for an upgrade, and now no more lagging.
Now, that could be the GPU, or the new processor, since they both got upgraded at the same time. But the new GPU definitely is helping with my non-Renpy games.