Project: Paper2D

Ok, so in general you already know about it.

Not quite, it’s 16x13 tiles, with one tile being 16x16 pixels (so its a little bit short of 256x256 in height; padded to get a pow2 size).

Nope, sorry. ` key doesn’t work for me, since I’m on a german QWERTZ layout (it doesn’t work in UT either). Even remapping it to something else like F12 in 4.8\Engine\Config\BaseInput.ini doesn’t work (but I think I’m simply editing wrong config here).
But closing Details panel does help a lot. And it seems that it might be a memory leak or something, since performance degrades over time with every click when Details panel is open.