This node submits URL(s) to Google PageSpeed Insights service to pull PageSpeed scores and other metrics provided by PageSpeed.
You will need a Google Account to obtain a Google PageSpeed Insight API key. To acquire an API key:
Google imposes a quota limit on PageSpeed Insights API usage. The current limit (as of September, 2015) is 25,000 requests / day and 1 requests / second. The default pause is 1 second between sending requests to Google to avoid exceeding quota.
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