VideoRevealed: Proxy Workflows in Adobe Premiere Pro
In this video tutorial, Colin Smith of VideoRevealed teaches how to use proxies in Premiere Pro. Proxy files are light-weight versions of the original camera files, and they are ideal for editing ultraHD footage, especially if you're editing with an older computer or on-the-go with a laptop. The proxy workflows in Premiere Pro CC 2015.3 make it easy to generate and attach proxy files. Colin gives you a step-by-step guide in this easy to follow tutorial.
This tutorial will show you how Premiere Pro will create and attach proxies so you can work on large frame sizes on slower systems. It also covers creating custom Ingest Presets in case you find the included presets don't fit your needs. —VideoRevealed
Source: https://youtu.be/993mbUa0h-w