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> and encoding speed

Table VI. Encoding Run Times for Equal PSNR_{YUV}, HEVC vs. VP9 (in %): 735.2

I.e., HM is over 7x slower than VP9's slowest settings. VP9 speeds have improved dramatically since then, and it is now being used real-time (Google is working on adding it to WebRTC), while still demonstrating significant quality improvements over prior generations.

See also https://news.ycombinator.com/item?id=9329580 w.r.t. the quality aspect.

HM is basically a tech demo. It's not meant to be a production encoder.

In my experience h265 and vp9 are fairly close in encoding speeds (less than 0.1x times the length of video duration).

I would strongly argue that h264 can ever outperform vp9 in video quality (given same number of bits), however, hardware/browser support will decide whether vp9 is adopted or not.

> HEVC (formerly H.265)

It's still H.265. Like past standards, HEVC/H.265 is a joint effort between ISO's MPEG and the ITU's VCEG. They're different identifiers for different organizations.