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If speed is more important than absolute realism, disabling Reflected Caustics–Indirect, Refracted Caustics–Direct and Refracted Caustics–Indirect will improve rendering times with an often acceptable loss of realism for architectural visualization work. Disabling Reflected Caustics–Direct will further improve rendering times, but at a sometimes significant loss of realism. Carefully compare the reflections of glass and metals onto other materials, and as well as the refraction of real (but not AGS) glass, before disabling these options for finish renderingswhen deciding if these optimizations are acceptable for your project.