Video rendering in Q3 and Q4 is entirely done through software. No graphics card is used.

Rendering speed depends on a lot of factors:
- overall size of the file
- (number and) size of textures used
- number of light sources used (!!)
- size and number of complex models (e.g. plants, trees!!)
- size of image/video (in pixels of resolution)

You can speed up rendering:
- by optimizing the above mentioned points
- making (temporarily) invisible models that are not visible, splitting your file in several parts, and/or (temporarily) delting part of the file (Do/Undo buttons can work wonders)
- read the FAQ where it says How can I speed up the rendering process in photo and video creation panes?

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