diff --git a/src/libcamera/software_isp/debayer_cpu.cpp b/src/libcamera/software_isp/debayer_cpu.cpp
index e56492848..bea153592 100644
--- a/src/libcamera/software_isp/debayer_cpu.cpp
+++ b/src/libcamera/software_isp/debayer_cpu.cpp
@@ -526,7 +526,7 @@ int DebayerCpu::configure(const StreamConfiguration &inputCfg,
 	window_.width = outputCfg.size.width;
 	window_.height = outputCfg.size.height;
 
-	/* Don't pass x,y since process() already adjusts src before passing it */
+	/* Don't pass x,y from window_ since process() already adjusts for it. */
 	stats_->setWindow(Rectangle(window_.size()));
 
 	/* pad with patternSize.Width on both left and right side */
diff --git a/src/libcamera/software_isp/debayer_egl.cpp b/src/libcamera/software_isp/debayer_egl.cpp
index 9ec966608..9ad7d6fe7 100644
--- a/src/libcamera/software_isp/debayer_egl.cpp
+++ b/src/libcamera/software_isp/debayer_egl.cpp
@@ -393,8 +393,11 @@ int DebayerEGL::configure(const StreamConfiguration &inputCfg,
 	window_.width = outputCfg.size.width;
 	window_.height = outputCfg.size.height;
 
-	/* Don't pass x,y since process() already adjusts src before passing it */
-	stats_->setWindow(Rectangle(window_.size()));
+	/*
+	 * Don't pass x,y from window_ since process() already adjusts for it.
+	 * But crop the window to 2/3 of its width and height for speedup.
+	 */
+	stats_->setWindow(Rectangle(window_.size()).croppedBy(2, 3));
 
 	LOG(Debayer, Debug) << "Input width " << inputCfg.size.width << " height " << inputCfg.size.height;
 	LOG(Debayer, Debug) << "Output width " << outputCfg.size.width << " height " << outputCfg.size.height;