In early 2014 there was an interesting article on how to build high performance with PHP applications with ReactPHP. The original article discusses using the Full Stack Symfony Framework. Drupal 8 is built upon the Symfony HttpKernel component and other bits and pieces from that very same team.
Search Engine Optimisation (SEO) used to be quite easy. Essentially you just had to be aware of how Google works on a high level and make sure you had a few key things done right and you could be fairly confortable that you were getting results. It was especially easy for SEO consultants to shine because of much of the competition in some industries was still a bunch of sleeping beauties.
Afraid to walk the streets
In the coldness all alone
The blackness of the night
Engulfs your flesh and bones
Hoping for relief
From the fear you feel inside
Losing all perspective
Of reality in the night
Running from shadows
Blinded by fear
The horror of nightfall
Is ever so near
I slowly surround you
As terror sets in
Are you afraid of the night
Drupal 8 is launching soon and so is PHP 7. It's worth noting that Drupal 8 does not officially support PHP 7 at launch date, so even if you were craving for the performance boost - it's better to wait until everything in Drupal 8 is tested and proved to be PHP 7 compatible.
For PHP 7 support in Drupal 7, the plan is to backport the compatibility at a later date, as the ticket is labeled as "needs backport to D7".
You can follow the progress of the Drupal 8 compatibility work over on the Drupal issue queue:
Around the time of the release of Drupal 8 there is a more significant, but subtle evolution taking over the web. This is HTTP/2, a new and improved version of the venerable protocol powering not only web sites and applications but a lot of infrastructure messaging for energy, industry and more.
The next big version of Drupal is launching on November 19th 2015. This also means that the end of line for Drupal 6 is set to February 24th 2015. After that date it will not receive any updates. Unlike some Linux distributions, like Redhat the system does not have a third party backer to backport fixes from Drupal 7 or 8 to version 6.
Drupal 8 is set to be released on November 19th 2015. It brings improvements to many aspects of the popular CMS, but the most significant ones remain hidden from user.
One of the core components that Drupal 8 adopted from the Symfony Project is the HttpKernel. This handled all incoming and outgoing HTTP traffic. In addition to the convenience and clarity, it also handles requests independently from each other.
Drupal 8 is a big change to the popular CMS. If you plan to get started with Drupal 8 development, you should understand that under the hood it's a very different beast from Drupal 6 and 7, versions that are still in use commonly.
Every technical article you read on previous versions needs to be read with a grain of salt. Luckily the basic concepts of the system (view, content types, modules and more) remain the same, so if you're just getting started with Drupal you're in luck. You're on the same starting point with many more experienced Drupal developer.