diff --git a/.circleci/config.yml b/.circleci/config.yml
index d4f9805b7b..a29fb9ee96 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,3 +1,7 @@
+# Disclaimer:
+# * Unless otherwise specified, assume `resource_class` and `parallelism` values are cherry-picked values that provided a reasonable enough build-duration-to-cost tradeoff at the time of choosing.
+# * There's too many variables (architecture types, CircleCI concurrency limitations, parallel pipeline runs, source code changes) to feel confident we've found a best-fit configuration.
+
 version: 2.1
 
 orbs:
@@ -473,9 +477,9 @@ jobs:
     parameters:
       platform:
         type: string
-    executor: << parameters.platform >>_medium
+    executor: << parameters.platform >>_large
     working_directory: << pipeline.parameters.build_dir >>/project
-    parallelism: 4
+    parallelism: 32
     steps:
       - generic_build
       - generic_test:
@@ -508,7 +512,7 @@ jobs:
         type: string
     executor: << parameters.platform >>_large
     working_directory: << pipeline.parameters.build_dir >>/project
-    parallelism: 2
+    parallelism: 16
     environment:
       E2E_TEST_FILTER: "GO"
     steps:
@@ -540,9 +544,9 @@ jobs:
     parameters:
       platform:
         type: string
-    executor: << parameters.platform >>_medium
+    executor: << parameters.platform >>_large
     working_directory: << pipeline.parameters.build_dir >>/project
-    parallelism: 2
+    parallelism: 10
     environment:
       E2E_TEST_FILTER: "EXPECT"
     steps: