The current build (85) seems to have a bit of a problem with garbage collection. I am getting some pretty bad frame jitter compared to the 85dev version I have (file dated 2/7/17). I will work on setting up a fiddle once I figure out where to begin (my app is fairly involved) and get enough free time.
I did take these performance screenshots in chrome (58) on Win7 64. These tests involved running around in a circle in one of my game zones for 10 seconds. I’ve ran the same test 5 times for each version and the results remained consistent.