diff --git a/java/google/registry/env/production/default/WEB-INF/appengine-web.xml b/java/google/registry/env/production/default/WEB-INF/appengine-web.xml
index 4e444a23f..7449a161c 100644
--- a/java/google/registry/env/production/default/WEB-INF/appengine-web.xml
+++ b/java/google/registry/env/production/default/WEB-INF/appengine-web.xml
@@ -7,7 +7,7 @@
   <sessions-enabled>true</sessions-enabled>
   <instance-class>B4_1G</instance-class>
   <manual-scaling>
-    <instances>30</instances>
+    <instances>15</instances>
   </manual-scaling>
 
   <system-properties>
diff --git a/java/google/registry/env/production/pubapi/WEB-INF/appengine-web.xml b/java/google/registry/env/production/pubapi/WEB-INF/appengine-web.xml
index d99ecf96a..de2869151 100644
--- a/java/google/registry/env/production/pubapi/WEB-INF/appengine-web.xml
+++ b/java/google/registry/env/production/pubapi/WEB-INF/appengine-web.xml
@@ -7,7 +7,7 @@
   <sessions-enabled>true</sessions-enabled>
   <instance-class>B4_1G</instance-class>
   <manual-scaling>
-    <instances>20</instances>
+    <instances>10</instances>
   </manual-scaling>
 
   <system-properties>
diff --git a/java/google/registry/env/sandbox/default/WEB-INF/appengine-web.xml b/java/google/registry/env/sandbox/default/WEB-INF/appengine-web.xml
index 5a8f92fb9..2cd7af386 100644
--- a/java/google/registry/env/sandbox/default/WEB-INF/appengine-web.xml
+++ b/java/google/registry/env/sandbox/default/WEB-INF/appengine-web.xml
@@ -7,7 +7,7 @@
   <sessions-enabled>true</sessions-enabled>
   <instance-class>B4_1G</instance-class>
   <manual-scaling>
-    <instances>30</instances>
+    <instances>10</instances>
   </manual-scaling>
 
   <system-properties>
diff --git a/java/google/registry/env/sandbox/pubapi/WEB-INF/appengine-web.xml b/java/google/registry/env/sandbox/pubapi/WEB-INF/appengine-web.xml
index e3881c7ce..e82dd364c 100644
--- a/java/google/registry/env/sandbox/pubapi/WEB-INF/appengine-web.xml
+++ b/java/google/registry/env/sandbox/pubapi/WEB-INF/appengine-web.xml
@@ -7,7 +7,7 @@
   <sessions-enabled>true</sessions-enabled>
   <instance-class>B4_1G</instance-class>
   <manual-scaling>
-    <instances>20</instances>
+    <instances>5</instances>
   </manual-scaling>
 
   <system-properties>