GAIJINKAZ'S PROFILE

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Like Title says, I want to make it possible for my Character to walk stairs up or down Diagonal, how can I event that or are there any Terrain or Region tag plugins for that ?

To Elaborate a little more to my Question from the title, I started to make a Project on RPG Maker MV, in it I had Maps in the Size of 256x256, but after putting just some events in (Below 100) and using some plugins like day night cycle, calendar, seasons etc. the frame rate dropped pretty bad to like 5-10fps. Now with RPG Maker MZ I deceided to redo it (Having Layers is Godsend for a Graphic designer). But this time I would like to avoid getting framedrops, but I do need Big Maps to work with my Gameplay. So what would be the most stable or save Map size ?