Pre-population notification “bubble”
When clicking on the bubble displays the progress bar as seen above.
In Network Mode Streaming the status bars will show up due to network streaming mode is multithreaded where Software Streaming is single threaded.
From looking at our streaming client log file, the pre-population happens serially (i.e., using a single-thread), whereas the Network Mode Streaming process can be configured to be multi-threaded and can grab many packages at the same time. The pre-population feature was designed to be less obtrusive and run quietly in the background without bothering the user (and stealing all his bandwidth) unlike the Network Mode Streaming feature which was designed to get all your applications installed ASAP.