I only have one photosphere to use as a reference, and it's been quite awhile since I had Marshmallow on this device so my memory isn't clear about how fast it used to bring it up. I will say that it does take quite a bit of time to fully render it (this particular photo is no longer on my device - it's just up in the cloud, so that may be the differentiating factor) and the blocky artifacts do take awhile to go away as I'm scrolling through the view. Once it's been fully rendered I don't see any hesitation in the view.Has anyone else noticed viewing photospheres from the photos app is a lot slower on nougat than marshmallow? After 'upgrading' to 7.0, I am now faced with faster battery usage, and black square 'artifacts' (they go away, but linger) when viewing photospheres.
Update: I restored that photosphere to my device (so that it's local now) and there's no appreciable difference in the rendering - the first time through there are still some artifacts that take awhile to go away.(this particular photo is no longer on my device - it's just up in the cloud, so that may be the differentiating factor) and the blocky artifacts do take awhile to go away as I'm scrolling through the view.
I've found that the most effective way of creating a PhotoSphere is to rotate the phone around one point rather than panning. When I pan badly is when I get the most artifacts.