From 4ce546b4ab27291f42863116a04261f958fb51f5 Mon Sep 17 00:00:00 2001
From: Natal Vande Casteele <natal@libius.be>
Date: Wed, 18 Jun 2025 20:20:25 +0200
Subject: [PATCH] Remove willReadFrequently hint

---
 src/ol/render/canvas/ExecutorGroup.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/ol/render/canvas/ExecutorGroup.js b/src/ol/render/canvas/ExecutorGroup.js
index 1920ea8f775..1d9435902e6 100644
--- a/src/ol/render/canvas/ExecutorGroup.js
+++ b/src/ol/render/canvas/ExecutorGroup.js
@@ -216,11 +216,14 @@ class ExecutorGroup {
 
     const newContext = !this.hitDetectionContext_;
     if (newContext) {
+      // Refrain from adding a 'willReadFrequently' hint in the options here.
+      // While it will remove the "Canvas2D: Multiple readback operations using
+      // getImageData are faster with the willReadFrequently attribute set
+      // to true" warnings in the console, it makes hitDetection extremely
+      // slow in Chrome when there are many features on the map
       this.hitDetectionContext_ = createCanvasContext2D(
         contextSize,
         contextSize,
-        undefined,
-        {willReadFrequently: false},
       );
     }
     const context = this.hitDetectionContext_;