Here's my experience on my local devices:

  * Quad i7 16 GBytes GTX 970 OSX FFox - perfectly smooth
  * iPhone 6s+ - very smooth
  * Nexus 6p - slightly jumpy / laggy but still impressive
  * Lumia 640 Windows Phone 10 - dFdx undeclared identifier (120,33)

There may be issues with webgl on the MBP if it's using Intel graphics, but I'd be pretty disappointed to get worse performance than an iPhone ...

For the curious, the Lumia error appears to stem from this: https://groups.google.com/forum/embed/#!topic/angleproject/-...