This is the glass table from previous postings. Here I have replaced the materials with Octane materials and rendered it with the GPU renderer Octane. It is about the speed of Redshift. See other GPU renderers for comparison.
This is the glass table from previous renders. This was done with Furry Ball, using Furry Ball materials and lights. It is another GPU renderer and it was faster than Redshift and Iray (see Iray table).
This is the glass table from previous renders. This was done with Iray, using Iray materials and lights. It is another GPU renderer and it took about the same amount of time as Redshift (see Redshift table).
This is a redo of the materials and lights for the table previously rendered with Arnold. I remade everything with Redshift. It rendered in a tiny fraction of the time it took with Arnold, since Redshift is a GPU renderer and Arnold is a CPU renderer.
Look at arnold glass table (and the previous 3 renderings) for comparisons with Arnold.