There's a process in my Activity Monitor called "com.apple.PhotoIngestService". It currently uses 411.4 MB of RAM, and has done so for the past 24 hours. Another process called "com.apple.ICPPhotoStreamLibraryService" has consistently stayed at 240.9 MB. Both processes were extremely active for about 30 minutes after I installed Yosemite, which along with their names, leads me to believe they're related to the new way that iCloud handles photos. A Google search for those processes turned up absolutely nothing so I'm wondering if anybody here can confirm my suspicions. It's not a huge concern, I'm just curious.