After implementing the code from the threejs example/loader/obj/mtl to load an object exported via Unity3d, some customers have reported browser crashes on their machines. A screenshot of the error message in a browser console can be viewed here.
Additionally, statistics displayed by threex.rendererstats.js can be found here.
As someone unfamiliar with threejs, I am unsure if the geometries being used are too large and if there are any restrictions in place despite utilizing the GPU. The version of threejs being utilized is r83.