Use software like Adobe Premiere Pro or DaVinci Resolve to "transcode" your raw files into a more manageable format, like ProRes Proxy or DNxHR.

In some creative communities (like Magic: The Gathering ), "proxy" refers to physical reproductions of cards. For these, "producing a paper" involves:

Once imported, you can toggle a "Use Proxies" button in your editor to switch between the low-res "editing" files and the high-res "master" files instantly. Physical "Paper" Proxies

Using tools like MTG Print to generate high-quality card images.