perf(Data/DFinsupp/Defs): use fast_instance% (leanprover-community#39929)

Extracted from leanprover-community#39846.

Author: riccardobrasca

Mathlib/Data/DFinsupp/Defs.lean

@@ -234,7 +234,7 @@ lemma coeFnAddMonoidHom_apply [∀ i, AddZeroClass (β i)] (v : Π₀ i, β i) :
   rfl
 
 instance addCommMonoid [∀ i, AddCommMonoid (β i)] : AddCommMonoid (Π₀ i, β i) :=
-  DFunLike.coe_injective.addCommMonoid _ coe_zero coe_add fun _ _ => coe_nsmul _ _
+  fast_instance% DFunLike.coe_injective.addCommMonoid _ coe_zero coe_add fun _ _ => coe_nsmul _ _
 
 instance [∀ i, AddGroup (β i)] : Neg (Π₀ i, β i) :=
   ⟨fun f => f.mapRange (fun _ => Neg.neg) fun _ => neg_zero⟩
@@ -267,12 +267,12 @@ theorem coe_zsmul [∀ i, AddGroup (β i)] (b : ℤ) (v : Π₀ i, β i) : ⇑(b
   rfl
 
 instance [∀ i, AddGroup (β i)] : AddGroup (Π₀ i, β i) :=
-  DFunLike.coe_injective.addGroup _ coe_zero coe_add coe_neg coe_sub (fun _ _ => coe_nsmul _ _)
-    fun _ _ => coe_zsmul _ _
+  fast_instance% DFunLike.coe_injective.addGroup _ coe_zero coe_add coe_neg coe_sub
+    (fun _ _ => coe_nsmul _ _) fun _ _ => coe_zsmul _ _
 
 instance addCommGroup [∀ i, AddCommGroup (β i)] : AddCommGroup (Π₀ i, β i) :=
-  DFunLike.coe_injective.addCommGroup _ coe_zero coe_add coe_neg coe_sub (fun _ _ => coe_nsmul _ _)
-    fun _ _ => coe_zsmul _ _
+  fast_instance% DFunLike.coe_injective.addCommGroup _ coe_zero coe_add coe_neg coe_sub
+    (fun _ _ => coe_nsmul _ _) fun _ _ => coe_zsmul _ _
 
 end Algebra