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Resolving Power - Disadvantages

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So I know resolving power is given by :

Resolvance = λ/Δλ = nN

Where n = order of fringe being observed and N is the no. of slits.

So I was thinking there are a few ways of increasing resolvance :

1.) Decrease the slit width
2.) Increase the order of the fringe we observe.
3.) Increase the number of slits.

However, wouldn't the first option cause a decrease in transmitted light and hence wouldnt our spectra have decreasing intensity ?

Also, for the second option, it is known that intensity of maximas decreases quite quickly from one order to the next... Hence, would our peak have poor intensity as well ?

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