PouchDB performance improvements in map/reduce between 3.2.0 and 3.2.1

pouchdb-perf-report.md

PouchDB performance improvements in map/reduce between 3.2.0 and 3.2.1

Test setup

Using the temp-views performance test in the standard PouchDB benchmarks (see TESTING.md), which builds up a secondary index and then queries it. So it tests the whole process of building the index as well as doing a paginated read a couple times (although the bulk of the time spent is in building).

Environment

2013 MacBook Air running OS X Yosemite 10.10.1. IE 11 is running on Windows 7 within VirtualBox. Node tests were run using Node 0.10.28.

Results

Browser/environment	Adapter	Before (ms)	After (ms)	Improvement
Chrome 39	IndexedDB	16608	10343	37.7228%
Firefox 36	IndexedDB	39344	19510	50.4118%
Safari 8	WebSQL	9228	5594	39.3801%
IE 11	IndexedDB	44810	19232	57.081%
Node 0.10	LevelDB	6178	3674	40.5309%

Further improvements in 3.2.2

The next version of PouchDB should be even faster for map/reduce builds, due to pouchdb/mapreduce#241 and pouchdb/mapreduce#243. Preliminary results indicate an additional 13% (Chrome), 27% (Node) and 52% (Firefox) improvement.