support81 ...when you use Fences the normal Desktop Icons displaying is held back until the full OS Boot Sequence is completed. Microsoft wants third party software to load only after that. The actual boot time difference for the OS is around 0.2 of a second... not enough to notice.
The curious thing is....if that Desktop Icon is a third party program it actually makes no difference to the time of loading of the program as the icon may be displayed sooner..but clicking on it will be held until the OS finishes booting anyway..
Result...without Fences the program will load at the end of Boot.
With Fences the program will load 0.2 seconds after Boot. [as Fences is also loading].
If you ran sidebar gadgets [as I do] they too do not appear till after the entire Boot sequence.
Post Windows 7, Microsoft wanted to give the impression the New OS's were faster and more snappy...so prioritised the desktop display loading to make it 'look finished'.
The trick is...Boot your system with and without Fences....and watch when the drive access light finishes in both...