compositor and cache optimizations

examples/pride.py

@@ -0,0 +1,21 @@
+from textual.app import App
+from textual.widgets import Static
+
+
+class PrideApp(App):
+    """Displays a pride flag."""
+
+    COLORS = ["red", "orange", "yellow", "green", "blue", "purple"]
+
+    def compose(self):
+        for color in self.COLORS:
+            stripe = Static()
+            stripe.styles.height = "1fr"
+            stripe.styles.background = color
+            yield stripe
+
+
+app = PrideApp()
+
+if __name__ == "__main__":
+    app.run()