Stat Priority (5.4.2)
Stats are the core of your character and how you choose to balance those stats will greatly impact the effectiveness of your Discipline Priest. Use this guide to select the stats that are the most important for your Priest and learn how to prioritize those stats to optimize your performance.
Spirit > Intellect > Crit > Mastery > Haste
Spirit Increases the rate of your Mana regeneration. Spirit is the best stat for Mana efficiency. Only stack enough Spirit to to have just enough Mana for an encounter.
Intellect Increases the power of your heals and slightly improves your spell critical chance.
Crit Increases the chance for spells and heals to critically hit. Helps proc Divine Aegis and can increase the amount of damage absorbed by Power Word Shield and Spirit Shell.
Mastery Mastery Shield Discipline increases the amount of damage absorbed by your shields including Power Word Shield and Divine Aegis.
Haste Reduces the cast time of spells, increases the ticking rate of Heal over Time (HoT) spells, and lowers the GCD. Stacking Haste increases your AoE healing due to the reduced cast time on Prayer of Healing. Assuming normal raid buffs, the most desirable Haste breakpoint is at 3039 Haste Rating from your gear and provides 1 extra tick on Renew.