Prepass Only	Lock	Auto Load	Auto Save	Render Time (s)
OFF	OFF	OFF	ON	42 Seconds
OFF	OFF	ON	ON	27 Seconds
OFF	ON	ON	ON	14 Seconds
ON	OFF	ON	ON	13 Seconds

Prepass Only	Lock	Auto Load	Auto Save	Render Time (s)
OFF	OFF	OFF	ON	39 Seconds
OFF	OFF	ON	ON	27 Seconds
OFF	ON	ON	ON	14 Seconds
ON	OFF	ON	ON	13 Seconds

Prepass Only	Lock	Auto Load	Auto Save	Render Time (s)
OFF	OFF	OFF	ON	17 Seconds
OFF	OFF	ON	ON	15 Seconds
OFF	ON	ON	ON	13 Seconds
ON	OFF	ON	ON	2 Seconds

Prepass Only	Lock	Auto Load	Auto Save	Render Time (s)
OFF	OFF	OFF	ON	16 Seconds
OFF	OFF	ON	ON	15 Seconds
OFF	ON	ON	ON	13 Seconds
ON	OFF	ON	ON	2 Seconds

* All test were run on my macbook pro
2.2 GHz Core 2 Duo with 3 GB 667 DDR2 in Cinema 4D 11.5