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I’m using GAPI library (in PHP) for querying Google Analytics API.
I request 2 dimensions (pagePath, date), 2 metric (pageviews, visits), past 365 days time range, and 2 filters for pagePath. Average time to get data for one query is 25-30 sec.
When I use only 1 metric (pageviews), average response time is 3 sec.
Why would there be such a difference when using 1 or 2 metrics?
I’m guessing that the path/date/pageviews is stored pre-calculated, while the path/date/visits needs to be calculated off the data-store (be thankful you’re not applying complicated segments – then it gets really slow).
There’s hints about how this might work in the google BigTable paper.