diff --git a/ct/go/worker_scripts/capture_skps/main.go b/ct/go/worker_scripts/capture_skps/main.go
index 337baf9..5988fcc 100644
--- a/ct/go/worker_scripts/capture_skps/main.go
+++ b/ct/go/worker_scripts/capture_skps/main.go
@@ -23,7 +23,7 @@
 
 const (
 	// The number of goroutines that will run in parallel to capture SKPs.
-	WORKER_POOL_SIZE = 10
+	WORKER_POOL_SIZE = 5
 )
 
 var (
diff --git a/ct/go/worker_scripts/pixel_diff/main.go b/ct/go/worker_scripts/pixel_diff/main.go
index c96f813..40af1ce 100644
--- a/ct/go/worker_scripts/pixel_diff/main.go
+++ b/ct/go/worker_scripts/pixel_diff/main.go
@@ -24,7 +24,7 @@
 
 const (
 	// The number of goroutines that will run in parallel to run pixel diff.
-	WORKER_POOL_SIZE = 10
+	WORKER_POOL_SIZE = 5
 
 	// Hacky way to detect when webpages are missing.
 	// See https://bugs.chromium.org/p/skia/issues/detail?id=6778&desc=2#c2