Primitives are listed under the first release where they are within a factor of two of optimal performance, that is, writing results as fast as the memory supports it.
15.0:
⊣ ⊢ + × ⌈ ⌊ | ⊣ ⊢
~ × ⌈ ⌊ | ∨ ∧ ⍱ ⍲ < ≤ = ≥ > ≠ ≡ ≢
16.0:
⌽ ⊖ ⌽ ⊖ ⍪ ⌿ ⍀ ⊥ ⊤
/ \ (with BMI2, introduced 2013)
17.0:
- ÷ * ⍟ ! ○ ⍕ + - ÷ * ⍟ ! ⌷
Room for improvement:
⍸ ⍉ ⌹ ○ , ⍉ ⌹
⊖ ⊖ ⌿ ⍀ (when ⊃⌽⍴⍵ is small)
⍒ ⍋ ∪ ⍳ ~ ∪ ∩ ∊ ⍸ ⍷ ⍒ ⍋
(monads) (dyads)