diff --git a/src/mtlfns.m b/src/mtlfns.m
index 8e0305997e6..4fcfea6b86e 100644
--- a/src/mtlfns.m
+++ b/src/mtlfns.m
@@ -606,6 +606,27 @@ frame.  Returns t while animations are enabled, nil otherwise.  */)
   return Qt;
 }
 
+DEFUN ("mtl-vsync", Fmtl_vsync, Smtl_vsync, 1, 2, 0,
+       doc: /* Enable (non-nil) or disable display sync for FRAME's GPU layer.
+With vsync on (default) presents wait for the display refresh: redisplay
+is capped at the panel rate, which keeps CPU/GPU use minimal.  With it
+off, presents return immediately (lower latency, uncapped, more power).
+FRAME defaults to the selected frame.  */)
+  (Lisp_Object enable, Lisp_Object frame)
+{
+  if (NILP (frame)) frame = Fselected_frame ();
+  CHECK_LIVE_FRAME (frame);
+  g_mtl_vsync_enabled = !NILP (enable);
+  MtlFrameData *fd = mtl_get_frame_data (XFRAME (frame));
+  if (fd && fd.metalLayer)
+    {
+      block_input ();
+      fd.metalLayer.displaySyncEnabled = g_mtl_vsync_enabled;
+      unblock_input ();
+    }
+  return enable;
+}
+
 void
 syms_of_mtlfns (void)
 {
@@ -632,6 +653,7 @@ syms_of_mtlfns (void)
   defsubr (&Smtl_video_move);
   defsubr (&Smtl_video_tick);
   defsubr (&Smtl_anim_tick);
+  defsubr (&Smtl_vsync);
 }
 
 #endif /* HAVE_MTL */
diff --git a/src/mtlterm.h b/src/mtlterm.h
index 9f67d0793fa..568b4ff9c08 100644
--- a/src/mtlterm.h
+++ b/src/mtlterm.h
@@ -293,6 +293,7 @@ extern MtlScrollEasing g_mtl_scroll_easing;
 extern float           g_mtl_scroll_duration; /* seconds, default 0.15 */
 extern NSUInteger      g_mtl_trail_len;        /* default 20 */
 extern BOOL            g_mtl_animations_enabled; /* default NO (animations are opt-in) */
+extern BOOL            g_mtl_vsync_enabled;       /* default YES (60fps power cap) */
 
 /* -----------------------------------------------------------------------
    Global Metal display list
diff --git a/src/mtlterm.m b/src/mtlterm.m
index 5f58b73f175..572d1226598 100644
--- a/src/mtlterm.m
+++ b/src/mtlterm.m
@@ -262,6 +262,11 @@ MtlScrollEasing g_mtl_scroll_easing  = MTL_EASE_OUT_QUAD;
 float           g_mtl_scroll_duration = 0.15f;
 NSUInteger      g_mtl_trail_len       = 20;
 
+/* When false, presents do not wait for the display refresh
+   (CAMetalLayer.displaySyncEnabled): redisplay never blocks on a
+   drawable, trading the 60 fps power cap for NS-like latency.  */
+BOOL g_mtl_vsync_enabled = YES;
+
 /* Master switch for the GPU animation layer (cursor effects, particles,
    CADisplayLink @60fps).  OFF by default: the goal is pixel-correct parity
    with the NS backend first.  When off, the cursor is drawn directly into the
@@ -781,6 +786,7 @@ mtl_setup_frame (struct frame *f)
   layer.device        = g_device;
   layer.pixelFormat   = MTLPixelFormatBGRA8Unorm;
   layer.framebufferOnly = YES;
+  layer.displaySyncEnabled = g_mtl_vsync_enabled;
   layer.frame         = view.bounds;
   layer.autoresizingMask = kCALayerWidthSizable | kCALayerHeightSizable;