add speedups

CHANGELOG.md

@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## Unreleased 
+
+### Added
+
+- Added experimental opt-in support for https://github.com/willmcgugan/textual-speedups
+
 ## [3.3.0] - 2025-06-01
 
 ### Fixed

src/textual/_compositor.py

@@ -419,7 +419,7 @@ def reflow(self, parent: Widget, size: Size) -> ReflowResult:
         resized_widgets = {
             widget
             for widget, (region, *_) in changes
-            if (widget in common_widgets and old_map[widget].region[2:] != region[2:])
+            if (widget in common_widgets and old_map[widget].region.size != region.size)
         }
         return ReflowResult(
             hidden=hidden_widgets,

src/textual/geometry.py

@@ -5,6 +5,7 @@
 
 from __future__ import annotations
 
+import os
 from functools import lru_cache
 from operator import attrgetter, itemgetter
 from typing import (
@@ -1315,6 +1316,13 @@ def grow_maximum(self, other: Spacing) -> Spacing:
         )
 
 
+if not TYPE_CHECKING and os.environ.get("TEXTUAL_SPEEDUPS") == "1":
+    try:
+        from textual_speedups import Offset, Region, Size, Spacing
+    except ImportError:
+        pass
+
+
 NULL_OFFSET: Final = Offset(0, 0)
 """An [offset][textual.geometry.Offset] constant for (0, 0)."""