User blog comment:Rappy 4187/Technical Update: July 20, 2016/@comment-26154973-20160721213248/@comment-24473195-20160722102912

While there were probably underlying changes, the newpp report is dynamic and will offer more information if the module is not optimized. Previously whenever a a module took more than a second to execute, the profiler would show more information to help improve usage, see this. Now it seems to show the virtual memory usage instead.

This bug report seems applicable (PHP7 might use more memory than PHP 5.6):

https://phabricator.wikimedia.org/T72006