iCloud photo library taking weeks to upload
I upgraded my iCloud storage plan and activated iCloud Photo Library on my primary Mac 7 days ago. I have 13,149 photos and 417 videos. The Photos library in Finder is 133 GB. I set my Mac to never go to sleep so the library can upload even when I'm not using it. It's been 7 days and it says "Uploading 12,275 items."
I have a decent internet connection and can usually get 1-3 mbps upload speeds consistently through my Airport Express. I realize this isn't the fastest speed, but even doing a conservative estimate at 0.5 mbps, the 133 GB should be uploaded in less than four days. It's been 7 days and it's not even 1/10th finished. At this rate it's going to take two months of my Mac running constantly, and I don't have the patience for that as it bogs my internet connection.
Any ideas of what might be wrong or how I might speed this up?
iMac, OS X Yosemite (10.10.3)