Two points:

1. We are adding support for all the file property functions. In coming Mathematica versions and CloudObject paclet updates, FileDate and FileByteCount on a CloudObject should work as expected.

2. CloudObjectInformation is being improved to be more performant. In particular, you can ask for a single property:

   CloudObjectInformation[obj, "Path"]

or a subset of properties:

CloudObjectInformation[obj, {"FileByteCount", "LastAccessed"}]

And only the information requested will be returned from the cloud, making it a faster call.

Further, CloudObjectInformation[obj, "UUID"] is optimized to return immediately with no network call if obj is a CloudObject expression with a URL in the canonical by-UUID format that CloudObject[] returns.

Also, you can query multiple objects at the same time, e.g.

CloudObjectInformation[CloudObjects["Type" -> Delayed], {"UUID", "Path"}]

and this returns its information in one efficient network call.