Load them there cores
The sample NUC's CPU is about half as speedy as a desktop Core i3-2100 in this all-core test.
And it's also about the same comparative speed in 7-zip's built-in file compression benchmark. Use the application to zip up, say, 1GB worth of data and the speed difference is immediately noticeable.
Is half a Core i3-2100 a recurring them here, perhaps?