We've talked about proxies before, but things have changed in the latest version of Blender (v2.93.1). So let's have another look, and while we're at it I will show you a neat way to easily switch between proxies.
Time codes:
0:00 Proxies intro
0:18 Enabled by Default (based on Preview's default View Setting)
0:41 Automatically generated (based on selected Proxy Render Size)
4:02 Easy switching between Proxies and Original file using Workspaces
The sample 4K video file is available from: • 4K VIDEO | Beautiful 4K Color Smoke Video