When it’s time for the final export, I swap the original videos back in for processing and maximum quality is maintained. With that much reduction in processing, the preview bounces back up to real-time and editing is smooth. If the source is 4K and I generate proxies at 640x360 and I edit on the proxies, then the CPU has 36 times less data to process. Proxies get around this by creating duplicate videos at a smaller resolution. The basic premise is that the CPU cannot keep up with decoding, filtering, and compositing all the videos for a real-time preview.
Or suppose you’ve got top-of-the-line hardware and it still stutters because you’ve decided to shove 8K video through the CPU.
Suppose you’ve got dirt-old hardware like I do and it cannot play back 4K source videos without stuttering.
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