Tailored engines like Irradiance Map or Brute Force to handle indoor light distribution efficiently.

: Ensure the V-Ray Denoiser is enabled to remove "salt and pepper" noise from dark interior corners. Solid tools - Pro - SketchUp Community

Websites like offer premium VROPT files. While free files exist, paid "pro" VROPT files ($5–$15) are often "newer" and tailored to GPU rendering (RTX).

Interior scenes are notoriously difficult because they rely on indirect light. A good .vropt file balances the sunlight (V-Ray Sun) with interior artificial lights perfectly.