(uo) low performance with high resolution displays

[kfarr]

issues: using high resolution display reduces 3dstreet performance instead: instead work better in high res, or allow reduction of visual quality on high res

[vincentfretin]

It may be worse with 1.6.0, we removed the max canvas size https://github.com/aframevr/aframe/commit/c5bab4cda53f2e4a16a397d55957922b84e487a4