D2R monster difficulty LD/NLD distinction

1.10 Beta Patch Notes wrote:

Non-ladder Realm game monsters (except for SuperUniques) are now at 75% HP (Hell), 85% Defense (NM & Hell), and don't ramp AI speed depending on difficulty.
(source)

1.10 Patch Notes wrote:

Monsters (except for SuperUniques) in non-ladder Realm games are now at 75% HP (Hell), 85% AC (NM & Hell), and don't increase their AI speed for higher difficulties.

Arreat Summit wrote:

Ladder Games Have Increased Difficulty
Ladder Games offer a more challenging type of gameplay than players will find in Normal Games. Monster AI speeds have been increased. Reaction times increased for Ladder Nightmare and Hell games. Basically every monster acts like a super unique.
(source)