Speedmenus are automatically generated and loaded immediately (if enabled). They bypass all kinds of advertisements or anti-piracy messages and offer direct navigation to the main feature, extras or even individual chapters.
Speedmenus would be included in the actual Blu-ray files if the disc was ripped to a hard drive too, and be on a resulting backup disc.
SlySoft also points out that Speedmenus can be used with Blu-ray players that are older and not fully compatible with the Interactive menu contents of newer Blu-ray discs.
More information: SlySoft
