I'm running Cinema 4D release 11.5 on windows 7 64bit, 2.8ghz duo core intel, 6 gb ram, nvidia 8400gms. I tried to render a body of water inside a fish tank for 3 seconds with light caustics strength 150% and photon 600000 , and it took over an hour to finish rendering. how can i increase the rendering speed by at least 25%?