diff --git a/asv_bench/benchmarks/indexing_engines.py b/asv_bench/benchmarks/indexing_engines.py
index 0cbc300ee2fc4..60e07a9d1469c 100644
--- a/asv_bench/benchmarks/indexing_engines.py
+++ b/asv_bench/benchmarks/indexing_engines.py
@@ -35,25 +35,49 @@ class NumericEngineIndexing:
     params = [
         _get_numeric_engines(),
         ["monotonic_incr", "monotonic_decr", "non_monotonic"],
+        [True, False],
+        [10 ** 5, 2 * 10 ** 6],  # 2e6 is above SIZE_CUTOFF
     ]
-    param_names = ["engine_and_dtype", "index_type"]
+    param_names = ["engine_and_dtype", "index_type", "unique", "N"]
 
-    def setup(self, engine_and_dtype, index_type):
+    def setup(self, engine_and_dtype, index_type, unique, N):
         engine, dtype = engine_and_dtype
-        N = 10 ** 5
-        values = list([1] * N + [2] * N + [3] * N)
-        arr = {
-            "monotonic_incr": np.array(values, dtype=dtype),
-            "monotonic_decr": np.array(list(reversed(values)), dtype=dtype),
-            "non_monotonic": np.array([1, 2, 3] * N, dtype=dtype),
-        }[index_type]
+
+        if index_type == "monotonic_incr":
+            if unique:
+                arr = np.arange(N * 3, dtype=dtype)
+            else:
+                values = list([1] * N + [2] * N + [3] * N)
+                arr = np.array(values, dtype=dtype)
+        elif index_type == "monotonic_decr":
+            if unique:
+                arr = np.arange(N * 3, dtype=dtype)[::-1]
+            else:
+                values = list([1] * N + [2] * N + [3] * N)
+                arr = np.array(values, dtype=dtype)[::-1]
+        else:
+            assert index_type == "non_monotonic"
+            if unique:
+                arr = np.empty(N * 3, dtype=dtype)
+                arr[:N] = np.arange(N * 2, N * 3, dtype=dtype)
+                arr[N:] = np.arange(N * 2, dtype=dtype)
+            else:
+                arr = np.array([1, 2, 3] * N, dtype=dtype)
 
         self.data = engine(arr)
         # code belows avoids populating the mapping etc. while timing.
         self.data.get_loc(2)
 
-    def time_get_loc(self, engine_and_dtype, index_type):
-        self.data.get_loc(2)
+        self.key_middle = arr[len(arr) // 2]
+        self.key_early = arr[2]
+
+    def time_get_loc(self, engine_and_dtype, index_type, unique, N):
+        self.data.get_loc(self.key_early)
+
+    def time_get_loc_near_middle(self, engine_and_dtype, index_type, unique, N):
+        # searchsorted performance may be different near the middle of a range
+        #  vs near an endpoint
+        self.data.get_loc(self.key_middle)
 
 
 class ObjectEngineIndexing: