It looks like you need to switch to GPU rendering. Here's a similar example, done in WebGL, it renders very nicely in a browser, hundreds times faster than your

It looks like you need to switch to GPU rendering. Here's a similar example, done in WebGL, it renders very nicely in a browser, hundreds times faster than your renerer: http://madebyevan.com/webgl-path-tracing/ http://madebyevan.com/webgl-path-tracing/ (switch material to mirror, it's pretty cool)