1.8V question

Hi there,

• embedded 1.8 V voltage regulator for core supply (options to use the on-board 1.8 V regulator allows full speed operations,
  Since there's a starting bracket but no ending one I assume that there are some text missing, or was removed.
  I cannot find anything in the 'reference manual' saying that a ''better external 1.8V is needed''
  So what does this full speed operations mean?

• embedded 1.8 V voltage regulator for core supply (options to use the on-board 1.8 V regulator allows full speed operations,Thanx for the clarification
  /Yxan/