Yes, PHP 7 has been released and I couldn't resist testing its performance on my Windows development computer. The installation from zip was virtually the same as with PHP 5.5/5.6, I only had to install VC14-compiled Apache (which also works fine with PHP 5.6 VC11) and install a newer Visual C++ distributable, otherwise no surprises and everything worked right away.
I tested the load speed of a single page from two of my web applications - one of them is based on my home made web-MVC-like framework, the other one is based on Silex. What I tested was the entry page with a very simple login form. I used apache bench with this command:
ab -n 10 http://myapp.localhost/
App 1 - my own framework (mean time in milliseconds):
php5.6 opcache: 37.4 (35.5 without db)
php7 opcache: 35.7 (33.3 without db)
this page hits the postgres db once to fetch a single row - to see how much overhead the db connection has I did comparisons where I bypassed the db connection - results in the brackets.
App 2: Silex based, the login form does not hit the database:
php5.6 opcache: 26.5
php7 opcache: 21.1
The results are surprising to me because it is clear that opcache effectiveness depends a lot on the type of code. Silex is much larger and complex and includes many times more files than my framework and opcache is much more effective for it - to be honest I'm surprised to see that it can outperform my framework, which I always thought to be simple and theoretically should result in better performance.
Anyway, PHP 7 on Windows has some performance improvements but they don't seem huge. But considering that a large part of every request time is eaten by Apache alone I suspect that PHP speed improvements are much larger than my tests show. I think with a faster web server like nginx, the speed increase would be higher.