Google again pleased with analytics

Not so long ago, I still thought that it would be cool to have an opportunity in analytics to compare the performance of two months to each other. Already forgotten plainly, sranivay everything on the eye. And today I went to check the statistics on Google Analytics and saw a small addition next to the date: Comparison with:
Site . I thought it was an opportunity to compare the current site with another one, but by clicking I saw that you can select an additional date range.

We set an additional date range (and by default its duration coincides with the current one. If the current range is a month, then the additional date is also equal to the month but the previous one) and we see the following possibilities:

1) An additional graph appears in comparison with the current one.
2) Next to the main data appears a line reflecting the previous value and the percentage change.
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For example:

5,690 page views
Previous: 5,021 (+ 13.32%)

But the most interesting thing I saw in the section Review of traffic sources

There by dates all traffic sources and keywords are painted and the percentage of changes in values ​​is also shown.

This allows us to easily determine by which traffic sources there is more, and for which it is less, and to correct the situation accordingly.