diff --git a/include/ck/utility/sequence.hpp b/include/ck/utility/sequence.hpp
index 6e68690048..18bb36d112 100644
--- a/include/ck/utility/sequence.hpp
+++ b/include/ck/utility/sequence.hpp
@@ -199,55 +199,92 @@ template <index_t N>
 using make_index_sequence =
     typename __make_integer_seq<impl::__integer_sequence, index_t, N>::seq_type;
 
-// merge sequence
-template <typename Seq, typename... Seqs>
-struct sequence_merge
+// merge sequence - optimized to avoid recursive instantiation
+namespace detail {
+
+// Helper to concatenate multiple sequences in one step using fold expression
+template <typename... Seqs>
+struct sequence_merge_impl;
+
+// Base case: single sequence
+template <index_t... Is>
+struct sequence_merge_impl<Sequence<Is...>>
 {
-    using type = typename sequence_merge<Seq, typename sequence_merge<Seqs...>::type>::type;
+    using type = Sequence<Is...>;
 };
 
+// Two sequences: direct concatenation
 template <index_t... Xs, index_t... Ys>
-struct sequence_merge<Sequence<Xs...>, Sequence<Ys...>>
+struct sequence_merge_impl<Sequence<Xs...>, Sequence<Ys...>>
 {
     using type = Sequence<Xs..., Ys...>;
 };
 
-template <typename Seq>
-struct sequence_merge<Seq>
+// Three sequences: direct concatenation (avoids one level of recursion)
+template <index_t... Xs, index_t... Ys, index_t... Zs>
+struct sequence_merge_impl<Sequence<Xs...>, Sequence<Ys...>, Sequence<Zs...>>
 {
-    using type = Seq;
+    using type = Sequence<Xs..., Ys..., Zs...>;
 };
 
-// generate sequence
-template <index_t NSize, typename F>
-struct sequence_gen
+// Four sequences: direct concatenation
+template <index_t... As, index_t... Bs, index_t... Cs, index_t... Ds>
+struct sequence_merge_impl<Sequence<As...>, Sequence<Bs...>, Sequence<Cs...>, Sequence<Ds...>>
 {
-    template <index_t IBegin, index_t NRemain, typename G>
-    struct sequence_gen_impl
-    {
-        static constexpr index_t NRemainLeft  = NRemain / 2;
-        static constexpr index_t NRemainRight = NRemain - NRemainLeft;
-        static constexpr index_t IMiddle      = IBegin + NRemainLeft;
+    using type = Sequence<As..., Bs..., Cs..., Ds...>;
+};
 
-        using type = typename sequence_merge<
-            typename sequence_gen_impl<IBegin, NRemainLeft, G>::type,
-            typename sequence_gen_impl<IMiddle, NRemainRight, G>::type>::type;
-    };
+// General case: binary tree reduction (O(log N) depth instead of O(N))
+template <typename S1, typename S2, typename S3, typename S4, typename... Rest>
+struct sequence_merge_impl<S1, S2, S3, S4, Rest...>
+{
+    // Merge pairs first, then recurse
+    using left  = typename sequence_merge_impl<S1, S2>::type;
+    using right = typename sequence_merge_impl<S3, S4, Rest...>::type;
+    using type  = typename sequence_merge_impl<left, right>::type;
+};
 
-    template <index_t I, typename G>
-    struct sequence_gen_impl<I, 1, G>
-    {
-        static constexpr index_t Is = G{}(Number<I>{});
-        using type                  = Sequence<Is>;
-    };
+} // namespace detail
 
-    template <index_t I, typename G>
-    struct sequence_gen_impl<I, 0, G>
-    {
-        using type = Sequence<>;
-    };
+template <typename... Seqs>
+struct sequence_merge
+{
+    using type = typename detail::sequence_merge_impl<Seqs...>::type;
+};
+
+template <>
+struct sequence_merge<>
+{
+    using type = Sequence<>;
+};
+
+// generate sequence - optimized using __make_integer_seq to avoid recursive instantiation
+namespace detail {
+
+// Helper that applies functor F to indices and produces a Sequence
+// __make_integer_seq<sequence_gen_helper, index_t, N> produces sequence_gen_helper<index_t, 0, 1,
+// ..., N-1>
+template <typename T, T... Is>
+struct sequence_gen_helper
+{
+    // Apply a functor F to all indices at once via pack expansion (O(1) depth)
+    template <typename F>
+    using apply = Sequence<F{}(Number<Is>{})...>;
+};
+
+} // namespace detail
 
-    using type = typename sequence_gen_impl<0, NSize, F>::type;
+template <index_t NSize, typename F>
+struct sequence_gen
+{
+    using type =
+        typename __make_integer_seq<detail::sequence_gen_helper, index_t, NSize>::template apply<F>;
+};
+
+template <typename F>
+struct sequence_gen<0, F>
+{
+    using type = Sequence<>;
 };
 
 // arithmetic sequence
@@ -283,16 +320,30 @@ struct arithmetic_sequence_gen<0, IEnd, 1>
     using type = typename __make_integer_seq<WrapSequence, index_t, IEnd>::type;
 };
 
-// uniform sequence
+// uniform sequence - optimized using __make_integer_seq
+namespace detail {
+
+template <typename T, T... Is>
+struct uniform_sequence_helper
+{
+    // Apply a constant value to all indices via pack expansion
+    template <index_t Value>
+    using apply = Sequence<((void)Is, Value)...>;
+};
+
+} // namespace detail
+
 template <index_t NSize, index_t I>
 struct uniform_sequence_gen
 {
-    struct F
-    {
-        __host__ __device__ constexpr index_t operator()(index_t) const { return I; }
-    };
+    using type = typename __make_integer_seq<detail::uniform_sequence_helper, index_t, NSize>::
+        template apply<I>;
+};
 
-    using type = typename sequence_gen<NSize, F>::type;
+template <index_t I>
+struct uniform_sequence_gen<0, I>
+{
+    using type = Sequence<>;
 };
 
 // reverse inclusive scan (with init) sequence
diff --git a/include/ck/utility/statically_indexed_array.hpp b/include/ck/utility/statically_indexed_array.hpp
index d0735a32f6..f3d73e84a7 100644
--- a/include/ck/utility/statically_indexed_array.hpp
+++ b/include/ck/utility/statically_indexed_array.hpp
@@ -20,6 +20,7 @@ struct tuple_concat<Tuple<Xs...>, Tuple<Ys...>>
     using type = Tuple<Xs..., Ys...>;
 };
 
+// StaticallyIndexedArrayImpl uses binary split for O(log N) depth
 template <typename T, index_t N>
 struct StaticallyIndexedArrayImpl
 {