diff --git a/testsuite/gtk/meson.build b/testsuite/gtk/meson.build
index 731082fce7..44a344ffb6 100644
--- a/testsuite/gtk/meson.build
+++ b/testsuite/gtk/meson.build
@@ -59,6 +59,7 @@ tests = [
   ['slicelistmodel'],
   ['sorter'],
   ['sortlistmodel'],
+  ['sort-performance'],
   ['spinbutton'],
   ['stringlist'],
   ['templates'],
diff --git a/testsuite/gtk/sort-performance.c b/testsuite/gtk/sort-performance.c
new file mode 100644
index 0000000000..ef021b7a1f
--- /dev/null
+++ b/testsuite/gtk/sort-performance.c
@@ -0,0 +1,300 @@
+#include <gtk/gtk.h>
+#include <math.h>
+
+#define MAX_SIZE 1024000
+#define MAX_TIME (G_USEC_PER_SEC / 2)
+
+static inline guint
+quick_random (guint prev)
+{
+  prev ^= prev << 13;
+  prev ^= prev >> 17;
+  prev ^= prev << 5;
+  return prev;
+}
+
+static guint comparisons = 0;
+
+static int
+compare_string_object (gconstpointer a,
+                       gconstpointer b,
+                       gpointer      unused)
+{
+  GtkStringObject *sa = (GtkStringObject *) a;
+  GtkStringObject *sb = (GtkStringObject *) b;
+
+  comparisons++;
+
+  return gtk_ordering_from_cmpfunc (strcmp (gtk_string_object_get_string (sa),
+                                            gtk_string_object_get_string (sb)));
+}
+
+static GtkSorter *
+create_sorter (void)
+{
+  return gtk_custom_sorter_new (compare_string_object, NULL, NULL);
+}
+
+G_GNUC_UNUSED static void
+set_model (const char *testname,
+           GType       type,
+           GListModel *source,
+           guint       random)
+{
+  gint64 start, end, total;
+  GtkSliceListModel *slice;
+  GtkSorter *sorter;
+  GListModel *sort;
+  guint size = 1000;
+
+  slice = gtk_slice_list_model_new (source, 0, size);
+  sorter = create_sorter ();
+  sort = g_object_new (type,
+                       "sorter", sorter,
+                       NULL);
+  g_object_unref (sorter);
+
+  while (TRUE)
+    {
+      comparisons = 0;
+      start = g_get_monotonic_time ();
+      g_object_set (sort, "model", slice, NULL);
+      end = g_get_monotonic_time ();
+
+      total = (end - start);
+
+      g_print ("\"%s\", \"%s\",%8u,%8uus,%8u\n",
+               testname,
+               g_type_name (type),
+               size,
+               (guint) total,
+               comparisons);
+
+      if (total > MAX_TIME)
+        break;
+
+      size *= 2;
+      if (4 * total > 2 * MAX_TIME)
+        break;
+
+      gtk_slice_list_model_set_size (slice, size);
+      g_object_set (sort, "model", NULL, NULL);
+    }
+
+  g_object_unref (sort);
+  g_object_unref (slice);
+}
+
+static void
+append (const char *testname,
+        GType       type,
+        GListModel *source,
+        guint       random,
+        guint       fraction)
+{
+  gint64 start, end, total;
+  GtkSliceListModel *slice;
+  GtkSorter *sorter;
+  GListModel *sort;
+  guint size = 1000;
+
+  slice = gtk_slice_list_model_new (source, 0, (fraction - 1) * size / fraction);
+  sorter = create_sorter ();
+  sort = g_object_new (type,
+                       "model", slice,
+                       "sorter", sorter,
+                       NULL);
+  g_object_unref (sorter);
+
+  while (TRUE)
+    {
+      gtk_slice_list_model_set_size (slice, (fraction - 1) * size / fraction);
+      comparisons = 0;
+
+      start = g_get_monotonic_time ();
+      gtk_slice_list_model_set_size (slice, size);
+      end = g_get_monotonic_time ();
+
+      total = (end - start);
+
+      g_print ("\"%s\", \"%s\",%8u,%8uus,%8u\n",
+               testname,
+               g_type_name (type),
+               size,
+               (guint) total,
+               comparisons);
+
+      if (total > MAX_TIME)
+        break;
+
+      size *= 2;
+      if (4 * total > 2 * MAX_TIME ||
+          size > MAX_SIZE)
+        break;
+    }
+
+  g_object_unref (sort);
+  g_object_unref (slice);
+}
+
+static void
+append_half (const char *name,
+             GType       type,
+             GListModel *source,
+             guint       random)
+{
+  append (name, type, source, random, 2);
+}
+
+static void
+append_10th (const char *name,
+             GType       type,
+             GListModel *source,
+             guint       random)
+{
+  append (name, type, source, random, 10);
+}
+
+static void
+append_100th (const char *name,
+              GType       type,
+              GListModel *source,
+              guint       random)
+{
+  append (name, type, source, random, 100);
+}
+
+static void
+remove_test (const char *testname,
+             GType       type,
+             GListModel *source,
+             guint       random,
+             guint       fraction)
+{
+  gint64 start, end, total;
+  GtkSliceListModel *slice;
+  GtkSorter *sorter;
+  GListModel *sort;
+  guint size = 1000;
+
+  slice = gtk_slice_list_model_new (source, 0, size);
+  sorter = create_sorter ();
+  sort = g_object_new (type,
+                       "model", slice,
+                       "sorter", sorter,
+                       NULL);
+  g_object_unref (sorter);
+
+  while (TRUE)
+    {
+      gtk_slice_list_model_set_size (slice, size);
+      comparisons = 0;
+
+      start = g_get_monotonic_time ();
+      gtk_slice_list_model_set_size (slice, (fraction - 1) * size / fraction);
+      end = g_get_monotonic_time ();
+
+      total = (end - start);
+
+      g_print ("\"%s\", \"%s\",%8u,%8uus,%8u\n",
+               testname,
+               g_type_name (type),
+               size,
+               (guint) total,
+               comparisons);
+
+      if (total > MAX_TIME)
+        break;
+
+      size *= 2;
+      if (4 * total > 2 * MAX_TIME ||
+          size > MAX_SIZE)
+        break;
+    }
+
+  g_object_unref (sort);
+  g_object_unref (slice);
+}
+
+static void
+remove_half (const char *name,
+             GType       type,
+             GListModel *source,
+             guint       random)
+{
+  remove_test (name, type, source, random, 2);
+}
+
+static void
+remove_10th (const char *name,
+             GType       type,
+             GListModel *source,
+             guint       random)
+{
+  remove_test (name, type, source, random, 10);
+}
+
+static void
+remove_100th (const char *name,
+              GType       type,
+              GListModel *source,
+              guint       random)
+{
+  remove_test (name, type, source, random, 100);
+}
+
+static void
+run_test (GtkStringList      *source,
+          const char * const *tests,
+          const char         *test_name,
+          void (* test_func) (const char *name, GType type, GListModel *source, guint random))
+{
+  GType types[] = { 
+    GTK_TYPE_SORT_LIST_MODEL,
+    GTK_TYPE_SOR2_LIST_MODEL
+  };
+  guint random = g_random_int ();
+  guint i;
+
+  if (tests != NULL && !g_strv_contains (tests, test_name))
+    return;
+
+  for (i = 0; i < G_N_ELEMENTS (types); i++)
+    {
+      test_func (test_name, types[i], G_LIST_MODEL (source), random);
+    }
+}
+
+int
+main (int argc, char *argv[])
+{
+  GtkStringList *source;
+  guint random = g_random_int ();
+  guint i;
+  const char * const *tests;
+
+  gtk_test_init (&argc, &argv);
+
+  source = gtk_string_list_new (NULL);
+  for (i = 0; i < MAX_SIZE; i++)
+    {
+      gtk_string_list_take (source, g_strdup_printf ("%u", random));
+      random = quick_random  (random);
+    }
+
+  if (argc < 2)
+    tests = NULL;
+  else
+    tests = (const char **) argv + 1;
+
+  g_print ("\"test\",\"model\",\"model size\",\"time\",\"comparisons\"\n");
+  run_test (source, tests, "set-model", set_model);
+  run_test (source, tests, "append-half", append_half);
+  run_test (source, tests, "append-10th", append_10th);
+  run_test (source, tests, "append-100th", append_100th);
+  run_test (source, tests, "remove-half", remove_half);
+  run_test (source, tests, "remove-10th", remove_10th);
+  run_test (source, tests, "remove-100th", remove_100th);
+
+  return g_test_run ();
+}