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<a href="https://github.com/wikimedia/parsoid/commit/<a class=hub.com/wikimedia/parsoid/commit/0650195a08427d516731b35810e1c10d402ff8b0">0650195a0<a href="https://github.com/wikimedia/parsoid/commit/0650195a08427d516731b35810e1c10d402ff8b0">&quot;&gt;Fix performance regression caused by </a><a class="double-link" href="https://github.com/wikimedia/parsoid/commit/<a class="double-link" href="https://github.com/wikimedia/parsoid/commit/96203dbe134caf3c0d575a6a86d1d6fc35425000">96203dbe1</a>">96203dbe1</a><a href="https://github.com/wikimedia/parsoid/commit/0650195a08427d516731b35810e1c10d402ff8b0">

On the Barack Obama wt2html benchmark, averaged over median-10-of-12 runs:
  Before 96203dbe: 15.299s
  After  96203dbe: 16.794s
  With this patch: 14.482s

Optimizations done:

* Factor out the _processOne function to avoid creating a function object
  every time. (Saved .118s)
* Avoid a yield when the attribute array is zero-length. (Saved .645s)
* Avoid serialization point between key and value expansion. (Saved .272s)
* Avoid a yield when no async expansion needs to be done. (Saved 1.277s)

Change-Id: I2b579ec1e">2b579ec1e</a>

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