I have recently upgraded my QuickHostUK VPS from Ubuntu 14.04+PHP5.6 to Ubuntu 16.04+PHP7.08. Here is the crawl stats (accessible from Google Webmaster) on ‘Time spent downloading a page (in milliseconds)’.
As you can see below, all my sites improve the page crawling time after the major upgraded to PHP7.
PHP7 is at least twice as fast as PHP5.x. So you code should run at a lot faster even if you don’t need to change a single line of code. PHP7 also means less memory consumption and more requests served with the same resources!
Just remember, the Google considers the page loading speed as a hint of ranking. Faster web pages are placed higher in the search ranking. So obviously, the less page crawling time (faster page loading speed, less time spent on downloading a page), the better! (at least it does no harm)
–EOF (The Ultimate Computing & Technology Blog) —
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