SilverStripe 4 the latest version of SilverStripe, was released early this week (A couple of days ago, 8th Nov). This release is a major milestone in the development roadmap for SilverStripe. It creates a huge learning curve for developers, and for questions for businesses on upgrading your website's to SilverStripe 4.
Out of the 101 reasons you should start on thinking about upgrading we believe that these reasons will be a game changer for you.
From SilverStripe 3.6.0 (released on June 2017) the framework supports PHP 7. And according to the release announcement of SilverStripe this only made a significant improvement on the speed, and run 2 to 5 time faster on a PHP 7 installation.
SilverStripe 4 is developed to support php 7.1 + and is works much faster on PHP 7.
Responsive web is no more a new term. SilverStripe 4 CMS is built to work responsively. This does mean that it works on mobiles, tablets, and desktops. And the new CMS allows you to create content with almost all your devices with a web browser.
Protected files and file security
It has been one of the missing features of SilverStripe to add in file security. However the void has been filled in with the Secure assets module. Its no more the case and file security is an in built feature now for SilverStripe. When you open up a file it does show you options to secure it and restrict the access level to a certain group in SilverStripe. Here's a screenshot of the file permissions user interface.