Ok in V5I, you can select how much reflection you want, by using the user  render settings, click edit next to the compute reflection box, and go for small numbers for both options, use 3 minimum, otherwise it may not look good enough.

You can alo tweak the anti aliasing settings in this user mode. If you don't have ecosystems in your render, go for min9, max12, 70%.

if you have ecosystems, then you'll need to bump it up to min 12, max 18, 75%

Even more if you have animated ( wind) vegetation, there is other way, I'm afraid to go for insane high AA settings , otherwise you get a flickering animation if you use global illumination. or you can wait for a  flicker free Vue6!

Also keep the  quality boost for advanced effects to max 46%, if you go over, you won't see much difference ( or none at all), but render times will go crazy.