1. Here's how
Render speed will decrease if your Scene is 'too complex' and your hardware isn't powerful enough and/or lacks available System Memory and Virtual Memory.
'Too complex' refers to the following variables:
|A: The number of different models you have added to the Scene.|
|B: The 3D Points number in the top right corner of Build Mode.|
|C: The number and resolution of textures/materials.|
|D: The Movie/Photo Effects you're using, in particular the Sky Light and Hyperlight effects.|
|E: How many Reflection Planes you've added in the Reflection Effect.|
|F: How many Spotlights that are set to Shadows: Dynamic in the Scene.|
|G: How many Spotlights you have selected in the Global Illumination Effect.|
|H: How many large surfaces you have assigned 3D Grass Materials to.|
1.1: To reduce the time it takes to render a Photo or a Clip, you should try to reduce the number of all of the above.
1.2: Please also note that you can shorten render times by reducing the Output quality, the Frames per second and Output resolution.
Example: Rendering a Clip at 1280x720 pixels in 3 star quality and 25 frames per second is a lot faster than rendering the Clip at 3840x2160 pixels in 5 star quality and 60 frames per second
1.3: Alternatively, you could consider upgrading your hardware:
Knowledge Base: What kind of computer does Lumion need?
Knowledge Base: Which graphics card do you need?