diff -r a1538c05d855 -r ae28d37f5969 contrib/automation/hgautomation/cli.py
--- a/contrib/automation/hgautomation/cli.py	Tue Feb 15 15:52:44 2022 +0100
+++ b/contrib/automation/hgautomation/cli.py	Thu Aug 26 17:47:50 2021 -0700
@@ -151,7 +151,7 @@
     image = aws.ensure_windows_dev_ami(c, base_image_name=base_image_name)
     DIST_PATH.mkdir(exist_ok=True)
 
-    with aws.temporary_windows_dev_instances(c, image, 't3.medium') as insts:
+    with aws.temporary_windows_dev_instances(c, image, 'm6i.large') as insts:
         instance = insts[0]
 
         winrm_client = instance.winrm_client
@@ -496,7 +496,7 @@
     sp.add_argument(
         '--instance-type',
         help='EC2 instance type to use',
-        default='t3.medium',
+        default='m6i.large',
     )
     sp.add_argument(
         '--python-version',