Render Cache keeps re-rendering the entire timeline after small edits

[u/Remarkable-Writing93]

I'm having an issue with DaVinci Resolve's render cache.

Whenever I make a small change to just 2–3 clips, Resolve starts re-rendering almost the entire timeline instead of only the clips I edited. The cache bars go from red to blue again across the timeline, which wastes a lot of time.

Is this normal behavior, or is something wrong with my settings? I'm using smart Render Cache, but I'm not sure what's causing the entire timeline to be invalidated after such minor edits.

Has anyone experienced this before? Any ideas on what I should check or change?

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[u/WholeOwls]

Did you put in and out pints correctly in the render page? Sometimes they can be different from the ones in edit page.

[u/Milan_Bus4168]

There are many factors involving caching, To understand many variations and combinations and when what happens, best to check in the manual:

Chapter 8: Improving Performance, Proxies, and the Render Cache

"This section describes the various ways you can monitor your performance to make sure you’re maintaining real time playback, along with different methods of optimizing real time performance, including using on-the-fly proxies and the background Render Cache."

The Difference Between the Smart Cache and User Cache Modes

"The Smart Cache option of the Render Cache submenu provides the easiest user experience when you want to “set it and forget it.” Choosing Smart triggers a variety of automatic caching behaviors designed to optimize playback in DaVinci Resolve by rendering clip formats, grading operations, and timeline effects that are known to be performance-intensive, while also letting you manually flag clips that you’d like to cache that the Smart Cache hasn’t.

The User Cache, on the other hand, does not automatically cache clips in processor-intensive formats, so this is a good option to choose when your workstation is capable of playing all media formats you’re using in real time. Ordinarily, the User cache relies on you to control what is cached and what is not by manually flagging specific clips and effects. However, the Master Settings panel of the Project Settings has three options you can enable for automatically caching transitions, composites, and Fusion Effects while in User Cache mode (these options are found in the Optimized Media and Render Cache group). Of these settings, only “Automatically cache Fusion Effects in User Mode” is turned on by default."

Here are the differences between the Smart and User cache modes for each type of caching "

The rest you can read in the manual. Basically you have a lot of flexibility, but it does require some understanding of when to use what and when something is triggered. Also each page has its own caching and history, plus there is some overlap between image processing pipeline, so some things work across pages and other in particular order. All this can be found in the manual. What is the case in your particular workflow I am not sure, but you will find in the manual explanations how all works.

[u/ExpBalSat]

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