@mrdenmark
My settings are as follows:

refreshInterval: 1000*60,  
scanInterval: 1000*60*10, // too many scans might cause API quota limit also.

So, that should be 1 minute and 10 minutes for refresh and scan intervals, respectively. I have tried changing this, and it does not affect the speed at which the individual pictures themselves transition.

I would have thought this had been asked, but I could not find it in this thread:

Is there any way to set the length of time (speed) the pictures will show for? I am using basically default settings in an album with 217 pictures, and the rate they display is very quick. Sometimes they will pop up several times a second, and then slow back down to around 10 seconds per picture. I would rather set it for 30 or even 60 seconds before it rotates. Is this possible?