You can change a few options:
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1- choose between studio lighting or environment map lighting
2- enable/disable Indigo logo (might speed rendering)

How to
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Edit options.xml, and change the options by "commenting" the line you want to disable.
Comments in xml work like this :

Let's say you have those two lines:
studio
env_map

* In that case, "studio" is commented/disabled :
<!-- studio -->
env_map


* In that case, "env_map" is commented/disabled  :
studio
<!-- env_map -->
