How frequently is Photo Stream synced to Aperture? I've been experiencing considerable delays between the time I take a photo and the time it shows up in Aperture's synced Photo Stream. Specifically, the photos show up on other devices that consume the iCloud Photo Stream, but Aperture seems to lag them substantially.

Is there a way to force Aperture to refresh its Photo Stream so that it matches the Photo Stream on iOS devices (and thus, presumably, its state in iCloud).
Normally Photo Stream should sync across devices within seconds, so long as the device that took the photo is on WiFi. However, I've also run into cases where Aperture's PhotoStream folder lags in showing recent images. When this happens I've been able to fix the issue by disabling and then re-enabling Photo Stream in Aperture's settings. It will re-sync everything in the Photo Stream folder, and new pictures show up almost instantly.

Hope this helps.