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Many of the renderers out there now support multiple resolutions of HDRI. Please check out sIBL:http://www.hdrlabs.com/sibl/index.htmlThe idea is you can use a low-rez hdri for for lighting, a middle-rez for reflections, and a hi-rez one for backgrounds, unless you are using a backplate. sIBL has some really good tools for creating all of these HDRI's from a single image. On the site, they say how much faster a render will finish if it uses low-rez lighting maps.
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