What is happening if i fly the camera on say the X-axis for hundreds of thousands of units, does this actually cost more processing power in any way?

Would it crash eventually?

on a philosophical note, can i find the end of the environment?

rather less, as there won't be any objects anymore. you should be able to go as far as the location variable allows, if it's stored as floats, then ~ 10^+/-37 units i guess
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I'm sitting, waiting, wishing, building Blender in superstition...