Since VLM can’t use the denoiser (as it is 3D) it requires more samples than surface lightmaps. In 4.27.0 I introduced more settings to allow you put more samples into VLM:
Also VLM sampling is improved too and that should help a bit with the noise. See https://github.com/EpicGames/UnrealEngine/commit/6c8590c0d7e425f1b36af478e16679ccf2053447
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