>This may not be right but either there is no difference in loading time with Explorer and BBLean in fact BBLean times 5 to 10 seconds more, so I will rely on your study regarding the CPU usage.

Loading time with WE is a fake - it shows your desktop early enough, but it's not finished then. It keeps working for minutes after that until it scans all the directories mentioned in the start menu. Not just the files behind the shortcuts, but ALL the files in all the subdirectories below their directories.