In reply to mark k..

@mark k. there are tons of resources out there showing the improvements of php7 over the previous versions. its not just the improved opcache, many calls were rewritten, structures were improved ( see array code for example ). If you don't wont be bothered to do your own tests, don't hag the rest of the people with your suppositions.

I, for one, I applaud the efforts yoast team is doing in improving the safety and awareness of their users. walk the walk, they say.