Without the usage of Haste/Improved Haste, the cap for ApR( Attacks per Round) is 5. However, spells and their ilk can raise the cap above 5 to a maximum of 10.
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Roboghost, that is why I like to play on HoF( Heart of Fury) mode.

Cold Wights give a whooping 7600XP each on HoF mode.
XP on HoF is calculated as such,
(Base XP * 4) + 2000
Due to the x4 multiplier, the XP gains on later levels is INCREDIBLE.