Interesting! I would imagine that my coding isnt very speed optimized hence the 7 min to export the whole lot but I am stumped why it takes 10min to start the render. Just out of curiosity: how big is the .lxo file for your rims?
I did some more poking around and got a question to the Devs: When I start Luxrender from a batch file like this:
"C:/Program Files/LuxRender v0.5/luxrender.exe" -t 4 "C:\Users\jan\Documents\Visual Studio 2005\Projects\Revit\LuxExporter\lxs testscenes\camera.lxs"
I get this messages running through for a got 10 minutes (see attachment)
But when I open the same file directly from Lux via file open it does not display thoses messages and starts to render in under 1 minute