You are mistaking the problems with WordPress as something that is inherit in PHP. That might have been true years ago, but modern php (php7 and hhvm) is a very powerful and mature language with rock solid performance, and in the case of hhvm that performance is equal to native,and in many cases faster than even C++. When written correctly and running in the right architecture it scales seemlessly and delivers low latency and high throughput. Sorry if you thought you could pay some indian 3 bucks an hour to slap together a wordpress site and be the next facebook.
Choosing the CMS to start a blog or a website development project is a big decision, particularly if you aren’t going with WordPress. You’ll need to meticulously research different interface options, what add-ons and extensions are offered, coding capabilities, and layout templates. However, as we have seen, there are plenty of WordPress alternatives out there to try before you make your final decision.
One downside of most of these services is that, should you someday want to move to another web host, you'll likely be out of luck because of the custom code they use to display your site. Only a few of the services here let you take your site to another web hosting service: The most complete example of this is Weebly, which lets you download the standard site server folders. Squarespace offers some transferability by letting you output your site in standard WordPress format. As you might expect, the same transferability holds for WordPress.com.
Another of the WordPress competitors, Kentico, is a user-friendly, highly adaptable offering. It requires minimal coding to yield any number of customizations and functionalities. Digital marketers and tech enthusiasts flock to Kentico because it is fully APS-integrated (an open-source framework that allows for building apps in several programming languages in tandem) and lets you integrate with Google from the start. WHICH IS BETTER: Squarespace vs. Wordpress