diff --git a/include/nlohmann/detail/iterators/iter_impl.hpp b/include/nlohmann/detail/iterators/iter_impl.hpp
index 6e6cc0ef6..6a0d2cef5 100644
--- a/include/nlohmann/detail/iterators/iter_impl.hpp
+++ b/include/nlohmann/detail/iterators/iter_impl.hpp
@@ -277,18 +277,22 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
     {
         JSON_ASSERT(m_object != nullptr);
 
-        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
-        {
-            JSON_ASSERT(m_it.array_iterator != m_object->m_data.m_value.array->end());
-            return *m_it.array_iterator;
-        }
-
+        // objects are tested before arrays here and in the other operators:
+        // with arrays first, walking a document of objects such as
+        // twitter.json took 14% more cycles than with 3.12.0's switch; with
+        // objects first, no document walks slower than with 3.12.0
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::object))
         {
             JSON_ASSERT(m_it.object_iterator != m_object->m_data.m_value.object->end());
             return m_it.object_iterator->second;
         }
 
+        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
+        {
+            JSON_ASSERT(m_it.array_iterator != m_object->m_data.m_value.array->end());
+            return *m_it.array_iterator;
+        }
+
         // neither array nor object: a primitive value (null has no value to point to)
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type != value_t::null && m_it.primitive_iterator.is_begin()))
         {
@@ -306,18 +310,18 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
     {
         JSON_ASSERT(m_object != nullptr);
 
-        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
-        {
-            JSON_ASSERT(m_it.array_iterator != m_object->m_data.m_value.array->end());
-            return &*m_it.array_iterator;
-        }
-
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::object))
         {
             JSON_ASSERT(m_it.object_iterator != m_object->m_data.m_value.object->end());
             return &(m_it.object_iterator->second);
         }
 
+        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
+        {
+            JSON_ASSERT(m_it.array_iterator != m_object->m_data.m_value.array->end());
+            return &*m_it.array_iterator;
+        }
+
         // neither array nor object: a primitive value
         if (JSON_HEDLEY_LIKELY(m_it.primitive_iterator.is_begin()))
         {
@@ -346,18 +350,18 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
     {
         JSON_ASSERT(m_object != nullptr);
 
-        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
-        {
-            ++m_it.array_iterator;
-            return *this;
-        }
-
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::object))
         {
             std::advance(m_it.object_iterator, 1);
             return *this;
         }
 
+        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
+        {
+            ++m_it.array_iterator;
+            return *this;
+        }
+
         // neither array nor object: a primitive value
         ++m_it.primitive_iterator;
         return *this;
@@ -382,18 +386,18 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
     {
         JSON_ASSERT(m_object != nullptr);
 
-        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
-        {
-            --m_it.array_iterator;
-            return *this;
-        }
-
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::object))
         {
             std::advance(m_it.object_iterator, -1);
             return *this;
         }
 
+        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
+        {
+            --m_it.array_iterator;
+            return *this;
+        }
+
         // neither array nor object: a primitive value
         --m_it.primitive_iterator;
         return *this;
@@ -415,16 +419,16 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
             return true;
         }
 
-        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
-        {
-            return (m_it.array_iterator == other.m_it.array_iterator);
-        }
-
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::object))
         {
             return (m_it.object_iterator == other.m_it.object_iterator);
         }
 
+        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
+        {
+            return (m_it.array_iterator == other.m_it.array_iterator);
+        }
+
         // neither array nor object: a primitive value
         return (m_it.primitive_iterator == other.m_it.primitive_iterator);
     }
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index f91671e82..1ed74f706 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -24506,18 +24506,22 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
     {
         JSON_ASSERT(m_object != nullptr);
 
-        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
-        {
-            JSON_ASSERT(m_it.array_iterator != m_object->m_data.m_value.array->end());
-            return *m_it.array_iterator;
-        }
-
+        // objects are tested before arrays here and in the other operators:
+        // with arrays first, walking a document of objects such as
+        // twitter.json took 14% more cycles than with 3.12.0's switch; with
+        // objects first, no document walks slower than with 3.12.0
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::object))
         {
             JSON_ASSERT(m_it.object_iterator != m_object->m_data.m_value.object->end());
             return m_it.object_iterator->second;
         }
 
+        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
+        {
+            JSON_ASSERT(m_it.array_iterator != m_object->m_data.m_value.array->end());
+            return *m_it.array_iterator;
+        }
+
         // neither array nor object: a primitive value (null has no value to point to)
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type != value_t::null && m_it.primitive_iterator.is_begin()))
         {
@@ -24535,18 +24539,18 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
     {
         JSON_ASSERT(m_object != nullptr);
 
-        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
-        {
-            JSON_ASSERT(m_it.array_iterator != m_object->m_data.m_value.array->end());
-            return &*m_it.array_iterator;
-        }
-
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::object))
         {
             JSON_ASSERT(m_it.object_iterator != m_object->m_data.m_value.object->end());
             return &(m_it.object_iterator->second);
         }
 
+        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
+        {
+            JSON_ASSERT(m_it.array_iterator != m_object->m_data.m_value.array->end());
+            return &*m_it.array_iterator;
+        }
+
         // neither array nor object: a primitive value
         if (JSON_HEDLEY_LIKELY(m_it.primitive_iterator.is_begin()))
         {
@@ -24575,18 +24579,18 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
     {
         JSON_ASSERT(m_object != nullptr);
 
-        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
-        {
-            ++m_it.array_iterator;
-            return *this;
-        }
-
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::object))
         {
             std::advance(m_it.object_iterator, 1);
             return *this;
         }
 
+        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
+        {
+            ++m_it.array_iterator;
+            return *this;
+        }
+
         // neither array nor object: a primitive value
         ++m_it.primitive_iterator;
         return *this;
@@ -24611,18 +24615,18 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
     {
         JSON_ASSERT(m_object != nullptr);
 
-        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
-        {
-            --m_it.array_iterator;
-            return *this;
-        }
-
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::object))
         {
             std::advance(m_it.object_iterator, -1);
             return *this;
         }
 
+        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
+        {
+            --m_it.array_iterator;
+            return *this;
+        }
+
         // neither array nor object: a primitive value
         --m_it.primitive_iterator;
         return *this;
@@ -24644,16 +24648,16 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
             return true;
         }
 
-        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
-        {
-            return (m_it.array_iterator == other.m_it.array_iterator);
-        }
-
         if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::object))
         {
             return (m_it.object_iterator == other.m_it.object_iterator);
         }
 
+        if (JSON_HEDLEY_LIKELY(m_object->m_data.m_type == value_t::array))
+        {
+            return (m_it.array_iterator == other.m_it.array_iterator);
+        }
+
         // neither array nor object: a primitive value
         return (m_it.primitive_iterator == other.m_it.primitive_iterator);
     }