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Max Passes –Limits the maximum number of passes rendered in the interactive rendering mode.

Force Path Tracing – When on, Path tracing is always used as a primary and secondary solver in interactive rendering. This keeps the interactive rendering responsive, avoiding the cost of UHD Cache precomputation.

Fast Preview Denoise During Render – When enabled, the image is iteratively denoised during the render. This replaces a noisy render preview with a noiseless, albeit low-quality image that gets progressively refined as the render converges. It can help to get a quick estimate of the overall lighting in the scene.

If you need to change only one or a limited number of objects in the scene, you can save some render time by using the Render Selected option. You can choose to either render only the objects selected in the viewport, or you can create an include/exclude list.

The selected objects render, and have correct shadows, GI, and reflections from other objects in the scene, which means they can be placed into or over a previous render and look as if they had been part of the initial full render.