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IF we check the speed of UDK Editor vs UE4 Editor in about all the ways you work with, UDK is much faster, for exemple the material editor in UDK is near to real time manipolation, just like that, fast!!! and it reads the other work stuff faster too…
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I don’t think you can really compare them in that way as everything has been upgraded, UE4 was built to run on modern/latest gen hardware where as UDK was built to run on previous gen.
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… I suggest to Re-check-out UDK Editor and brainstorm why that is!? and if possible Re-use some old method ways of doing things! if technacly possible!? or even better improve old methods into new concepts!!! 
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surely it would be because old techniques have been replaced with newer ones that require more processing power, I mean what your saying is kind of like if I were to say “well I played GTA3 and GTA4 the other day and GTA3 ran a lot faster so maybe GTA4 should be remade the same way GTA3 was so it runs faster” which would result in a worse GTA4(although it wasn’t great anyway IMO but you get my point:)).