a few performance improvements #808
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this commit attempts to speed up process data summaries by: - removing a duplicate call to an expensive function (`apollo.submissions.utils.make_submission_dataframe`) in process data summaries - replacing a call to `pandas.DataFrame.apply(pandas.Series)` in the above function since it is slow. instead, the hierarchy is computed as a JSON object in PostgreSQL and loaded into the `pandas.DataFrame` using `pandas.read_sql()`, then 'split' using `pandas.io.json.json_normalize()`
separate geoJSON layer to reduce loading time and switch to canvas rendering to reduce reondering time.
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Most of the performance improvements in this PR are about reducing the amount of queries required to render a few slow pages and cutting back on rendering time for maps with a high number of data points.