Write about a perf change

Author: delan

_posts/2025-11-02-this-month-in-servo.md

@@ -89,6 +89,8 @@ To solve these problems, we’ve replaced <code>notify_keyboard_event</code> wit
 
 ## Perf and stability
 
+Servo now does **zero unnecessary layout work** when **updating canvases** and **animated images**, thanks to a new “UpdatedImageData” layout mode (@mrobinson, @mukilan, #38991).
+
 We’ve fixed crashes when clicking on web content on Android (@mrobinson, #39771), and when running Servo on platforms where JIT is forbidden (@jschwe, @sagudev, #40071, #40130).
 
 ## Donations

outline.txt

@@ -91,7 +91,7 @@
     - https://github.com/servo/servo/pull/40067	(@rayguo17, #40067)	fix http cache reconstruct response from cache after validation behaviour (#40067)
       network
 - perf
-    - https://github.com/servo/servo/pull/38991	(@mrobinson, @mukilan, #38991)	script: Skip running layout when only updating images or canvas (#38991)
+    - DONE https://github.com/servo/servo/pull/38991	(@mrobinson, @mukilan, #38991)	script: Skip running layout when only updating images or canvas (#38991)
       perf
     - https://github.com/servo/servo/pull/39629	(@jdm, #39629)	net: Share SVG font database between all image caches in the same process (#39629)
       perf

tools/commits.txt

@@ -483,7 +483,7 @@
     # better to update expectation and close the intermittent issue to avoid potential regression.
     # Testing: No behaviour change Fixes: #39505
 +https://github.com/servo/servo/pull/38991	(@mrobinson, @mukilan, #38991)	script: Skip running layout when only updating images or canvas (#38991)
-    perf
+    ;perf
     # Add a new super-lightweight layout mode that avoids any layout when canvas is updated or animated images progress to the
     # next frame.  In the future this can also be used for video elements.
     # Testing: This is a performance optimization, so shouldn't change any WPT test results.