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The options available in this tab will allow you to set the behavior for the UHD Cache GI Solver.

UI Path: ||Render settings window|| > Corona > Secondary GI: UHD Cache tab

Precomputation – Determines how the UHD /4K cache is obtained for rendering is obtained.

Available precomputation modes are:

Calculate from scratch – The cache is calculated independently for each frame in a precomputation pass when using this mode.
Load from file – The cache is loaded from a specified file instead of being computed. Good for animations as it prevents flickering.
Load from file + append – The cache is first loaded from the specified file, and then the precomputation pass runs on top of it when using this mode. The loaded and computed caches are merged. Good for animation precomputation (when ran e.g. every 30 frames).

After render – When set to Save, the UHD/4K cache is saved to the specified file after rendering, possibly overwriting it.

Filename – Here, you can specify the path where the cache file will be saved to or loaded from.