I have a 20w laser, and am trying to work with photo engraving. This is probably a stupid question but, after seeing the settings used for some finished work posted I’m curious if it’s possible to proportionally scale up the speed and power together to achieve the same result faster or is that wishful thinking?
I think this is more wishful thinking. The combination is typically not linear. So just doubling both won’t necessarily lead to the same result. The result depends on so many factors… and additionally highly individual.
Better run some material tests for YOUR requirements, and derive your own perfect settings.
@misken is probably correct here, but your theory is sound.
You can double it and see what kind of results you get, so you can correct for anything that turns out not to be linear.
Sometimes a loss of quality is acceptable. If it takes a microscope to see the imperfection, it might not be worth waiting an extra hour in processing to correct that minor, imperceptible to the eye, flaw.
If the machine is running so fast it’s ‘uncomfortable’ for you or moves the material, that’s not too beneficial.
Shouldn’t harm you or the machine to try it… 
In all probability there are preset ‘limits’ (in the controller) on most of these options…
As with all things physical, there are tradeoffs and limits.
Good luck
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