I was downloading the recent upload, I guess, but it still have the same problem : slow rendering, also the lighting layout didn't show when I press Tab button so I was left wondering the whole bamboo forest where the heck do I need to put them.
I was playing it through 1200px with fullscreen options and in Windows 10 64-bit, if that helps.
Anyway, watching the playthrough, it seems like one witty experimetal game!