diff --git a/app/os.go b/app/os.go
index 812222bc..d396a4a7 100644
--- a/app/os.go
+++ b/app/os.go
@@ -46,6 +46,11 @@ type Config struct {
 	CustomRenderer bool
 }
 
+// ConfigEvent is sent whenever the configuration of a Window changes.
+type ConfigEvent struct {
+	Config Config
+}
+
 func (c *Config) apply(m unit.Metric, options []Option) {
 	for _, o := range options {
 		o(m, c)
@@ -135,9 +140,6 @@ type driver interface {
 	// Configure the window.
 	Configure([]Option)
 
-	// Config returns the current configuration.
-	Config() Config
-
 	// SetCursor updates the current cursor to name.
 	SetCursor(name pointer.CursorName)
 
@@ -187,4 +189,5 @@ func newWindowRendezvous() *windowRendezvous {
 	return wr
 }
 
-func (_ wakeupEvent) ImplementsEvent() {}
+func (wakeupEvent) ImplementsEvent() {}
+func (ConfigEvent) ImplementsEvent() {}
diff --git a/app/os_android.go b/app/os_android.go
index eb7a4138..a0d36f28 100644
--- a/app/os_android.go
+++ b/app/os_android.go
@@ -507,19 +507,20 @@ func (w *window) SetAnimating(anim bool) {
 }
 
 func (w *window) draw(sync bool) {
-	width, height := C.ANativeWindow_getWidth(w.win), C.ANativeWindow_getHeight(w.win)
-	if width == 0 || height == 0 {
+	size := image.Pt(int(C.ANativeWindow_getWidth(w.win)), int(C.ANativeWindow_getHeight(w.win)))
+	if size != w.config.Size {
+		w.config.Size = size
+		w.callbacks.Event(ConfigEvent{Config: w.config})
+	}
+	if size.X == 0 || size.Y == 0 {
 		return
 	}
 	const inchPrDp = 1.0 / 160
 	ppdp := float32(w.dpi) * inchPrDp
 	w.callbacks.Event(frameEvent{
 		FrameEvent: system.FrameEvent{
-			Now: time.Now(),
-			Size: image.Point{
-				X: int(width),
-				Y: int(height),
-			},
+			Now:    time.Now(),
+			Size:   w.config.Size,
 			Insets: w.insets,
 			Metric: unit.Metric{
 				PxPerDp: ppdp,
@@ -815,13 +816,12 @@ func (w *window) Configure(options []Option) {
 				w.config.Mode = Windowed
 			}
 		}
+		if w.config != prev {
+			w.callbacks.Event(ConfigEvent{Config: w.config})
+		}
 	})
 }
 
-func (w *window) Config() Config {
-	return w.config
-}
-
 func (w *window) Raise() {}
 
 func (w *window) SetCursor(name pointer.CursorName) {
diff --git a/app/os_ios.go b/app/os_ios.go
index 92c32fa2..54a81468 100644
--- a/app/os_ios.go
+++ b/app/os_ios.go
@@ -95,7 +95,6 @@ type window struct {
 
 	visible bool
 	cursor  pointer.CursorName
-	config  Config
 
 	pointerMap []C.CFTypeRef
 }
@@ -271,10 +270,6 @@ func (w *window) WriteClipboard(s string) {
 
 func (w *window) Configure([]Option) {}
 
-func (w *window) Config() Config {
-	return w.config
-}
-
 func (w *window) Raise() {}
 
 func (w *window) SetAnimating(anim bool) {
diff --git a/app/os_js.go b/app/os_js.go
index 5ccaf0da..4950e501 100644
--- a/app/os_js.go
+++ b/app/os_js.go
@@ -94,12 +94,12 @@ func newWindow(win *callbacks, options []Option) error {
 	})
 	w.addEventListeners()
 	w.addHistory()
-	w.Configure(options)
 	w.w = win
 
 	go func() {
 		defer w.cleanup()
 		w.w.SetDriver(w)
+		w.Configure(options)
 		w.blur()
 		w.w.Event(system.StageEvent{Stage: system.StageRunning})
 		w.resize()
@@ -528,10 +528,9 @@ func (w *window) Configure(options []Option) {
 		w.config.Orientation = cnf.Orientation
 		w.orientation(cnf.Orientation)
 	}
-}
-
-func (w *window) Config() Config {
-	return w.config
+	if w.config != prev {
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 }
 
 func (w *window) Raise() {}
@@ -571,8 +570,14 @@ func (w *window) resize() {
 	w.scale = float32(w.window.Get("devicePixelRatio").Float())
 
 	rect := w.cnv.Call("getBoundingClientRect")
-	w.config.Size.X = int(rect.Get("width").Float()) * int(w.scale)
-	w.config.Size.Y = int(rect.Get("height").Float()) * int(w.scale)
+	size := image.Point{
+		X: int(float32(rect.Get("width").Float()) * w.scale),
+		Y: int(float32(rect.Get("height").Float()) * w.scale),
+	}
+	if size != w.config.Size {
+		w.config.Size = size
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 
 	if vx, vy := w.visualViewport.Get("width"), w.visualViewport.Get("height"); !vx.IsUndefined() && !vy.IsUndefined() {
 		w.inset.X = float32(w.config.Size.X) - float32(vx.Float())*w.scale
@@ -588,18 +593,14 @@ func (w *window) resize() {
 }
 
 func (w *window) draw(sync bool) {
-	width, height, insets, metric := w.getConfig()
-	if metric == (unit.Metric{}) || width == 0 || height == 0 {
+	size, insets, metric := w.getConfig()
+	if metric == (unit.Metric{}) || size.X == 0 || size.Y == 0 {
 		return
 	}
-
 	w.w.Event(frameEvent{
 		FrameEvent: system.FrameEvent{
-			Now: time.Now(),
-			Size: image.Point{
-				X: width,
-				Y: height,
-			},
+			Now:    time.Now(),
+			Size:   size,
 			Insets: insets,
 			Metric: metric,
 		},
@@ -607,8 +608,8 @@ func (w *window) draw(sync bool) {
 	})
 }
 
-func (w *window) getConfig() (int, int, system.Insets, unit.Metric) {
-	return w.config.Size.X, w.config.Size.Y, system.Insets{
+func (w *window) getConfig() (image.Point, system.Insets, unit.Metric) {
+	return image.Pt(w.config.Size.X, w.config.Size.Y), system.Insets{
 			Bottom: unit.Px(w.inset.Y),
 			Right:  unit.Px(w.inset.X),
 		}, unit.Metric{
diff --git a/app/os_macos.go b/app/os_macos.go
index 62426a91..1ee4df7e 100644
--- a/app/os_macos.go
+++ b/app/os_macos.go
@@ -252,10 +252,9 @@ func (w *window) Configure(options []Option) {
 			C.toggleFullScreen(w.window)
 		}
 	}
-}
-
-func (w *window) Config() Config {
-	return w.config
+	if w.config != prev {
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 }
 
 func (w *window) SetCursor(name pointer.CursorName) {
@@ -389,20 +388,23 @@ func gio_onChangeScreen(view C.CFTypeRef, did uint64) {
 func (w *window) draw() {
 	w.scale = float32(C.getViewBackingScale(w.view))
 	wf, hf := float32(C.viewWidth(w.view)), float32(C.viewHeight(w.view))
-	if wf == 0 || hf == 0 {
+	sz := image.Point{
+		X: int(wf*w.scale + .5),
+		Y: int(hf*w.scale + .5),
+	}
+	if sz != w.config.Size {
+		w.config.Size = sz
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
+	if sz.X == 0 || sz.Y == 0 {
 		return
 	}
-	width := int(wf*w.scale + .5)
-	height := int(hf*w.scale + .5)
 	cfg := configFor(w.scale)
 	w.setStage(system.StageRunning)
 	w.w.Event(frameEvent{
 		FrameEvent: system.FrameEvent{
-			Now: time.Now(),
-			Size: image.Point{
-				X: width,
-				Y: height,
-			},
+			Now:    time.Now(),
+			Size:   w.config.Size,
 			Metric: cfg,
 		},
 		Sync: true,
diff --git a/app/os_wayland.go b/app/os_wayland.go
index 0753fcd2..3a6112d6 100644
--- a/app/os_wayland.go
+++ b/app/os_wayland.go
@@ -187,7 +187,9 @@ type window struct {
 	serial   C.uint32_t
 	newScale bool
 	scale    int
-	config   Config
+	// size is the unscaled window size (unlike config.Size which is scaled).
+	size   image.Point
+	config Config
 
 	wakeups chan struct{}
 }
@@ -222,7 +224,7 @@ func init() {
 	wlDriver = newWLWindow
 }
 
-func newWLWindow(window *callbacks, options []Option) error {
+func newWLWindow(callbacks *callbacks, options []Option) error {
 	d, err := newWLDisplay()
 	if err != nil {
 		return err
@@ -232,10 +234,14 @@ func newWLWindow(window *callbacks, options []Option) error {
 		d.destroy()
 		return err
 	}
-	w.w = window
+	w.w = callbacks
 	go func() {
 		defer d.destroy()
 		defer w.destroy()
+		// Finish and commit setup from createNativeWindow.
+		w.Configure(options)
+		C.wl_surface_commit(w.surf)
+
 		w.w.SetDriver(w)
 		if err := w.loop(); err != nil {
 			panic(err)
@@ -356,15 +362,12 @@ func (d *wlDisplay) createNativeWindow(options []Option) (*window, error) {
 	C.xdg_surface_add_listener(w.wmSurf, &C.gio_xdg_surface_listener, unsafe.Pointer(w.surf))
 	C.xdg_toplevel_add_listener(w.topLvl, &C.gio_xdg_toplevel_listener, unsafe.Pointer(w.surf))
 
-	w.Configure(options)
-
 	if d.decor != nil {
 		// Request server side decorations.
 		w.decor = C.zxdg_decoration_manager_v1_get_toplevel_decoration(d.decor, w.topLvl)
 		C.zxdg_toplevel_decoration_v1_set_mode(w.decor, C.ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE)
 	}
 	w.updateOpaqueRegion()
-	C.wl_surface_commit(w.surf)
 	return w, nil
 }
 
@@ -487,8 +490,7 @@ func gio_onToplevelClose(data unsafe.Pointer, topLvl *C.struct_xdg_toplevel) {
 func gio_onToplevelConfigure(data unsafe.Pointer, topLvl *C.struct_xdg_toplevel, width, height C.int32_t, states *C.struct_wl_array) {
 	w := callbackLoad(data).(*window)
 	if width != 0 && height != 0 {
-		w.config.Size.X = int(width)
-		w.config.Size.Y = int(height)
+		w.size = image.Pt(int(width), int(height))
 		w.updateOpaqueRegion()
 	}
 }
@@ -855,7 +857,7 @@ func (w *window) flushFling() {
 	w.fling.xExtrapolation = fling.Extrapolation{}
 	w.fling.yExtrapolation = fling.Extrapolation{}
 	vel := float32(math.Sqrt(float64(estx.Velocity*estx.Velocity + esty.Velocity*esty.Velocity)))
-	_, _, c := w.getConfig()
+	_, c := w.getConfig()
 	if !w.fling.anim.Start(c, time.Now(), vel) {
 		return
 	}
@@ -908,11 +910,12 @@ func (w *window) WriteClipboard(s string) {
 }
 
 func (w *window) Configure(options []Option) {
-	_, _, cfg := w.getConfig()
+	_, cfg := w.getConfig()
 	prev := w.config
 	cnf := w.config
 	cnf.apply(cfg, options)
 	if prev.Size != cnf.Size {
+		w.size = image.Pt(cnf.Size.X/w.scale, cnf.Size.Y/w.scale)
 		w.config.Size = cnf.Size
 	}
 	if prev.Title != cnf.Title {
@@ -921,10 +924,9 @@ func (w *window) Configure(options []Option) {
 		C.xdg_toplevel_set_title(w.topLvl, title)
 		C.free(unsafe.Pointer(title))
 	}
-}
-
-func (w *window) Config() Config {
-	return w.config
+	if w.config != prev {
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 }
 
 func (w *window) Raise() {}
@@ -1374,7 +1376,7 @@ func (w *window) onPointerMotion(x, y C.wl_fixed_t, t C.uint32_t) {
 
 func (w *window) updateOpaqueRegion() {
 	reg := C.wl_compositor_create_region(w.disp.compositor)
-	C.wl_region_add(reg, 0, 0, C.int32_t(w.config.Size.X), C.int32_t(w.config.Size.Y))
+	C.wl_region_add(reg, 0, 0, C.int32_t(w.size.X), C.int32_t(w.size.Y))
 	C.wl_surface_set_opaque_region(w.surf, reg)
 	C.wl_region_destroy(reg)
 }
@@ -1404,9 +1406,9 @@ func (w *window) updateOutputs() {
 	}
 }
 
-func (w *window) getConfig() (int, int, unit.Metric) {
-	width, height := w.config.Size.X*w.scale, w.config.Size.Y*w.scale
-	return width, height, unit.Metric{
+func (w *window) getConfig() (image.Point, unit.Metric) {
+	size := w.size.Mul(w.scale)
+	return size, unit.Metric{
 		PxPerDp: w.ppdp * float32(w.scale),
 		PxPerSp: w.ppsp * float32(w.scale),
 	}
@@ -1419,7 +1421,11 @@ func (w *window) draw(sync bool) {
 	if dead || (!anim && !sync) {
 		return
 	}
-	width, height, cfg := w.getConfig()
+	size, cfg := w.getConfig()
+	if size != w.config.Size {
+		w.config.Size = size
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 	if cfg == (unit.Metric{}) {
 		return
 	}
@@ -1430,11 +1436,8 @@ func (w *window) draw(sync bool) {
 	}
 	w.w.Event(frameEvent{
 		FrameEvent: system.FrameEvent{
-			Now: time.Now(),
-			Size: image.Point{
-				X: width,
-				Y: height,
-			},
+			Now:    time.Now(),
+			Size:   w.config.Size,
 			Metric: cfg,
 		},
 		Sync: sync,
@@ -1458,12 +1461,12 @@ func (w *window) surface() (*C.struct_wl_surface, int, int) {
 		C.xdg_surface_ack_configure(w.wmSurf, w.serial)
 		w.needAck = false
 	}
-	width, height, scale := w.config.Size.X, w.config.Size.Y, w.scale
 	if w.newScale {
-		C.wl_surface_set_buffer_scale(w.surf, C.int32_t(scale))
+		C.wl_surface_set_buffer_scale(w.surf, C.int32_t(w.scale))
 		w.newScale = false
 	}
-	return w.surf, width * scale, height * scale
+	sz, _ := w.getConfig()
+	return w.surf, sz.X, sz.Y
 }
 
 func (w *window) ShowTextInput(show bool) {}
diff --git a/app/os_windows.go b/app/os_windows.go
index 59a9a98f..c9ac8b47 100644
--- a/app/os_windows.go
+++ b/app/os_windows.go
@@ -428,20 +428,23 @@ func (w *window) setStage(s system.Stage) {
 func (w *window) draw(sync bool) {
 	var r windows.Rect
 	windows.GetClientRect(w.hwnd, &r)
-	w.config.Size.X = int(r.Right - r.Left)
-	w.config.Size.Y = int(r.Bottom - r.Top)
+	size := image.Point{
+		X: int(r.Right - r.Left),
+		Y: int(r.Bottom - r.Top),
+	}
 	if w.config.Size.X == 0 || w.config.Size.Y == 0 {
 		return
 	}
+	if size != w.config.Size {
+		w.config.Size = size
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 	dpi := windows.GetWindowDPI(w.hwnd)
 	cfg := configForDPI(dpi)
 	w.w.Event(frameEvent{
 		FrameEvent: system.FrameEvent{
-			Now: time.Now(),
-			Size: image.Point{
-				X: w.config.Size.X,
-				Y: w.config.Size.Y,
-			},
+			Now:    time.Now(),
+			Size:   w.config.Size,
 			Metric: cfg,
 		},
 		Sync: sync,
@@ -531,10 +534,9 @@ func (w *window) Configure(options []Option) {
 	if prev.Mode != cnf.Mode {
 		w.SetWindowMode(cnf.Mode)
 	}
-}
-
-func (w *window) Config() Config {
-	return w.config
+	if w.config != prev {
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 }
 
 func (w *window) SetWindowMode(mode WindowMode) {
diff --git a/app/os_x11.go b/app/os_x11.go
index 42d52bf4..1b01020c 100644
--- a/app/os_x11.go
+++ b/app/os_x11.go
@@ -161,10 +161,9 @@ func (w *x11Window) Configure(options []Option) {
 	if prev.Mode != cnf.Mode {
 		w.SetWindowMode(cnf.Mode)
 	}
-}
-
-func (w *x11Window) Config() Config {
-	return w.config
+	if w.config != prev {
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 }
 
 func (w *x11Window) Raise() {
@@ -355,11 +354,8 @@ loop:
 		if (anim || syn) && w.config.Size.X != 0 && w.config.Size.Y != 0 {
 			w.w.Event(frameEvent{
 				FrameEvent: system.FrameEvent{
-					Now: time.Now(),
-					Size: image.Point{
-						X: w.config.Size.X,
-						Y: w.config.Size.Y,
-					},
+					Now:    time.Now(),
+					Size:   w.config.Size,
 					Metric: w.metric,
 				},
 				Sync: syn,
@@ -516,7 +512,10 @@ func (h *x11EventHandler) handleEvents() bool {
 			w.w.Event(key.FocusEvent{Focus: false})
 		case C.ConfigureNotify: // window configuration change
 			cevt := (*C.XConfigureEvent)(unsafe.Pointer(xev))
-			w.config.Size = image.Pt(int(cevt.width), int(cevt.height))
+			if sz := image.Pt(int(cevt.width), int(cevt.height)); sz != w.config.Size {
+				w.config.Size = sz
+				w.w.Event(ConfigEvent{Config: w.config})
+			}
 			// redraw will be done by a later expose event
 		case C.SelectionNotify:
 			cevt := (*C.XSelectionEvent)(unsafe.Pointer(xev))
diff --git a/app/window.go b/app/window.go
index 4669b9af..1a286590 100644
--- a/app/window.go
+++ b/app/window.go
@@ -263,17 +263,6 @@ func (w *Window) Option(opts ...Option) {
 	})
 }
 
-// Config returns the Window configuration.
-//
-// A FrameEvent will occur whenever the configuration changes.
-func (w *Window) Config() Config {
-	var cnf Config
-	w.driverRun(func(d driver) {
-		cnf = d.Config()
-	})
-	return cnf
-}
-
 // ReadClipboard initiates a read of the clipboard in the form
 // of a clipboard.Event. Multiple reads may be coalesced
 // to a single event.