Photos does look great, but Apple decided to completely ignore iPhoto while making this. iPhoto has so many bugs and problems and there is nothing I can do but sit and wait for them to release Photos.
I strongly recommend using "iPhoto Buddy' (free) or "iPhoto Library Manager" ($20) to divide iPhoto library into smaller libraries.
Also, I read somewhere that not all SSDs in Apple laptops are the same. Some are from samsung and some are from Toshiba. And supposedly Toshiba ones are much slower than Samsung ones and someone claimed it was barely faster than a mechanical HD.
But anyhow, the point is you should at least use "iPhoto Buddy' (free) or "iPhoto Library Manager" ($20). Or even better, I recommend using the howto I posted in this same thread.
I'm just missing some statement on how the performance is, especially since we all have like several hundred GBs or even TBs worth of pictures nowadays. It's only a preview with screenshots though...
I believe Adobe has already released a plugin to import your Aperture library into Lightroom.
> iPhoto was often criticized for choking on large image libraries, but Apple says it built Photos to handle large and growing photo libraries, since people are taking so many more photos than they used to before. From our experience, it seems that Apple's efforts have paid off: the new Photos app effortlessly scrolls through thousands of photos, [...]
[1] http://www.theverge.com/2015/2/5/7979925/apple-photos-app-ne...