Key for X5R users is the proxy media support and enhancements and fixes that allow for use of regular (non-Premiere specific) CineLight Adobe DNG sequences directly in your project.
Proxy media support allows you to to easily switch between original/high-resolution and proxy/low-resolution clips. Heavy X5R RAW media can overload even the most powerful computer systems. Using lower-resolution proxies can speed up editing, while maintaining the ability to switch back to the original high resolution media for final output. With proxy creation, you can work with high-resolution media flexibly, across different devices (for example, on lightweight devices that are slower and have less storage). Switching between proxy/low-resolution and original/high-resolution files has never been easier or more fluid.
Proxy support how-to:
Work offline using proxy media | Adobe Premiere Pro CC tutorials
What's New:
Premiere Pro CC 2015 new features summary
Proxy media support allows you to to easily switch between original/high-resolution and proxy/low-resolution clips. Heavy X5R RAW media can overload even the most powerful computer systems. Using lower-resolution proxies can speed up editing, while maintaining the ability to switch back to the original high resolution media for final output. With proxy creation, you can work with high-resolution media flexibly, across different devices (for example, on lightweight devices that are slower and have less storage). Switching between proxy/low-resolution and original/high-resolution files has never been easier or more fluid.
Proxy support how-to:
Work offline using proxy media | Adobe Premiere Pro CC tutorials
What's New:
Premiere Pro CC 2015 new features summary