What are your settings - especially the preview generation one, on import? Are you creating DNGs? Are you applying any development preset and/or metadata/keyword? LR can do less or more while you're importing images. And its speed depends on that. Especially generating standard or smart previews can take a far longer time.
You should perform a comparison using compatible parameters - otherwise it becomes an apple to orange comparison...
Well, with Photos I didn't have to generate any previews at all - it imported my 2,000 RAW files (referenced) in about a minute, and I was immediately able to scroll around and edit with no slowdown.
In my LR I generate 1:1 previews on import. I would've had to wait an age
to have LR to generate 2,000 previews after import if I did the same test the other way around, something I didn't have to do with Photos. For all my other performance comparisons, I wait until LR has completely finished generating previews and whatnot before scrolling/editing/etc. Photos is still way faster.
Previews (with the exception of Smart Previews and the offlining benefits they provide) are basically a workaround for poor performance. This in itself isn't bad - many applications generate previews to improve performance. However, this should be a detail the user doesn't have to care about, and the number of "Should I generate 1:1 previews or smart previews of both?" articles online show that Adobe have failed in that regard.
I'm sure Photos generates previews as well, but it's not something the users notices or has to care about - as long as your imaging pipeline is fast enough, previews won't matter all that much.