A shader cache is essentially a pre-written dictionary. If another player has already visited the Hebra Mountains and endured the stutters, their emulator saved those translations into a file. If you download that file and place it in your Ryujinx folder, your computer no longer has to do the heavy lifting. It says, "Oh, I know this scenery. Here is the pre-compiled code."
: If you experience crashes after an update or notice visual artifacts, your cache might be corrupted. You can safely delete the files in the shader cache directory; Ryujinx will simply rebuild them as you play. GPU Settings NVIDIA Control Panel (or AMD equivalent), setting the Shader Cache Size ryujinx totk shader cache
You have downloaded a file named something like vulkan_0.cache (or 0000000000000000.bin ). Here is how to install the correctly. A shader cache is essentially a pre-written dictionary