diff --git a/gpu-dawn/.github/workflows/ci.yml b/gpu-dawn/.github/workflows/ci.yml
index db719a92..d3c1d962 100644
--- a/gpu-dawn/.github/workflows/ci.yml
+++ b/gpu-dawn/.github/workflows/ci.yml
@@ -5,7 +5,7 @@ on:
     types:
       - completed
 jobs:
-  x86_64-linux:
+  x86_64-linux_debug:
     runs-on: ubuntu-latest
     # We want to run on external PRs, but not on our own internal PRs as they'll be run by the push
     # to the branch.
@@ -28,6 +28,20 @@ jobs:
           gh release upload "release-$(git rev-parse --short HEAD)" zig-out/lib/libdawn_x86_64-linux-gnu_debug.a.gz
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  x86_64-linux_release-fast:
+    runs-on: ubuntu-latest
+    # We want to run on external PRs, but not on our own internal PRs as they'll be run by the push
+    # to the branch.
+    if: github.event.workflow_run.conclusion == 'success' && (github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository)
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Zig
+        run: |
+          sudo apt install xz-utils
+          sudo sh -c 'wget -c https://ziglang.org/builds/zig-linux-x86_64-0.10.0-dev.670+e1a535360.tar.xz -O - | tar -xJ --strip-components=1 -C /usr/local/bin'
+      - name: Clone mach-glfw
+        run: rm libs/mach-glfw && git clone https://github.com/hexops/mach-glfw libs/mach-glfw
       - name: install (release-fast)
         run: zig build install -Dfrom-source=true -Drelease-fast=true -Dtarget=x86_64-linux
       - name: upload (release-fast)
@@ -57,7 +71,7 @@ jobs:
   #     - name: install (debug)
   #       run: zig build install -Dfrom-source=true -Dtarget=x86_64-windows
   #     # TODO: upload step for Windows
-  x86_64-macos:
+  x86_64-macos_debug:
     runs-on: macos-latest
     # We want to run on external PRs, but not on our own internal PRs as they'll be run by the push
     # to the branch.
@@ -82,6 +96,20 @@ jobs:
           gh release upload "release-$(git rev-parse --short HEAD)" zig-out/lib/libdawn_x86_64-macos.12.1...12.1-gnu_debug.a.gz
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  x86_64-macos_release-fast:
+    runs-on: macos-latest
+    # We want to run on external PRs, but not on our own internal PRs as they'll be run by the push
+    # to the branch.
+    if: github.event.workflow_run.conclusion == 'success' && (github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository)
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Zig
+        run: |
+          brew install xz
+          sudo sh -c 'wget -c https://ziglang.org/builds/zig-macos-x86_64-0.10.0-dev.670+e1a535360.tar.xz -O - | tar -xJ --strip-components=1 -C /usr/local/bin'
+      - name: Clone mach-glfw
+        run: rm libs/mach-glfw && git clone https://github.com/hexops/mach-glfw libs/mach-glfw
       - name: install (release-fast)
         run: zig build install -Dfrom-source=true -Drelease-fast=true -Dtarget=x86_64-macos
         env: