Spell Casting Speed governs the speed at which you cast magical spells.
0 Knowledge starts at = -95% Spell Casting Speed
Every Knowledge point gives a % increase to Spell Casting speed depending on fixed thresholds
Magical Interaction Speed doesn’t seem to be implemented in the game yet.
0 Knowledge starts at = -75% Magical Interaction Speed
Every Knowledge point gives a % increase to Magical Interaction Speed depending on fixed thresholds
Spell Memory or Spell Capacity govern your spell cost cap, meaning equipping spells that exceed this cap will not be usable.
0 Knowledge starts at = 0 Spell Memory/Capacity
Every Knowledge point gives an increase to Spell Capacity