diff --git a/infra/testing/builders.pyl b/infra/testing/builders.pyl
index 84f6b594b8..d6fcb8db83 100644
--- a/infra/testing/builders.pyl
+++ b/infra/testing/builders.pyl
@@ -1145,9 +1145,9 @@
       {'name': 'mozilla', 'variant': 'code_serializer', 'shards': 1},
       {'name': 'mozilla', 'variant': 'extra'},
       {'name': 'optimize_for_size'},
-      {'name': 'test262', 'shards': 6},
+      {'name': 'test262', 'shards': 12},
       {'name': 'test262', 'variant': 'code_serializer', 'shards': 2},
-      {'name': 'test262', 'variant': 'extra', 'shards': 5},
+      {'name': 'test262', 'variant': 'extra', 'shards': 10},
       {'name': 'v8testing', 'shards': 3},
       {
         'name': 'v8testing',
@@ -1155,7 +1155,7 @@
         'test_args': ['--isolates'],
         'shards': 4
       },
-      {'name': 'v8testing', 'variant': 'extra', 'shards': 2},
+      {'name': 'v8testing', 'variant': 'extra', 'shards': 4},
       # Nosse3.
       {
         'name': 'mozilla',
@@ -1394,13 +1394,13 @@
       {'name': 'test262', 'shards': 7},
       {'name': 'test262', 'variant': 'extra', 'shards': 5},
       {'name': 'v8testing', 'shards': 2},
-      {'name': 'v8testing', 'variant': 'extra', 'shards': 2},
+      {'name': 'v8testing', 'variant': 'extra', 'shards': 4},
       {'name': 'v8testing', 'variant': 'minor_mc'},
       {'name': 'v8testing', 'variant': 'no_lfa'},
       {'name': 'v8testing', 'variant': 'slow_path'},
       {'name': 'v8testing', 'variant': 'stress_instruction_scheduling'},
       {'name': 'v8testing', 'variant': 'stress_concurrent_allocation'},
-      {'name': 'v8testing', 'variant': 'stress_concurrent_inlining'},
+      {'name': 'v8testing', 'variant': 'stress_concurrent_inlining', 'shards': 2},
       # Maglev -- move to extra once more architectures are supported.
       {'name': 'mjsunit', 'variant': 'maglev'},
       # Noavx.