diff --git a/.github/workflows/check-pkg-paths.yml b/.github/workflows/check-pkg-paths.yml
index 757f70b5ab6..dcfd6e4dc75 100644
--- a/.github/workflows/check-pkg-paths.yml
+++ b/.github/workflows/check-pkg-paths.yml
@@ -14,10 +14,16 @@
 
 name: Test Package Paths
 
-on: pull_request
+on:
+  workflow_run:
+    workflows: ["Build"]
+    types:
+      - completed
+  pull_request:
 
 jobs:
   test:
+    if: ${{ github.event.workflow_run.conclusion }} == 'success'
     name: Test Package Paths
     runs-on: ubuntu-latest
 
@@ -27,14 +33,22 @@ jobs:
       with:
         # This makes Actions fetch all Git history so run-changed script can diff properly.
         fetch-depth: 0
-    - name: Set up Node (20)
-      uses: actions/setup-node@v4
+    - uses: actions/setup-node@v4
       with:
         node-version-file: '.nvmrc'
-    - name: Yarn install
-      run: yarn
-    - name: Yarn build
-      run: yarn build
+        cache: yarn
+        cache-dependency-path: yarn.lock
+    - name: Restore cached node_modules
+      uses: actions/cache@v4
+      id: node_modules
+      with:
+        path: "**/node_modules"
+        key: node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+    - run: yarn install --frozen-lockfile
+    - name: Download build archive
+      uses: actions/download-artifact@v4
+      with:
+        name: dists-${{ github.sha }}
     - name: Swap in public typings
       run: yarn release:prepare
     - name: Check paths
diff --git a/.github/workflows/health-metrics-pull-request.yml b/.github/workflows/health-metrics-pull-request.yml
index 93aaf81a26f..b8663e85626 100644
--- a/.github/workflows/health-metrics-pull-request.yml
+++ b/.github/workflows/health-metrics-pull-request.yml
@@ -15,6 +15,10 @@
 name: Health Metrics
 
 on:
+  workflow_run:
+    workflows: ["Build"]
+    types:
+      - completed
   push:
     branches: ['**']
   pull_request:
@@ -35,24 +39,35 @@ env:
 jobs:
   binary-size:
     name: Binary Size
-    if: (github.event_name == 'push' || !(github.event.pull_request.head.repo.fork)) && (github.actor != 'dependabot[bot]')
+    if: (${{ github.event.workflow_run.conclusion }} == 'success' && (github.event_name == 'push' || !(github.event.pull_request.head.repo.fork)) && (github.actor != 'dependabot[bot]'))
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v4
         with:
           node-version-file: '.nvmrc'
+          cache: yarn
+          cache-dependency-path: yarn.lock
+      - name: Restore cached node_modules
+        uses: actions/cache@v4
+        id: node_modules
+        with:
+          path: "**/node_modules"
+          key: node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - run: yarn install --frozen-lockfile
       - uses: 'google-github-actions/auth@v0'
         with:
           credentials_json: '${{ secrets.GCP_SA_KEY }}'
       - uses: google-github-actions/setup-gcloud@v2
-      - run: yarn install
-      - run: yarn build
+      - name: Download build archive
+        uses: actions/download-artifact@v4
+        with:
+          name: dists-${{ github.sha }}
       - name: Run health-metrics/binary-size test
         run: yarn size-report
   modular-export-size:
     name: Binary Size For Modular Exports
-    if: (github.event_name == 'push' || !(github.event.pull_request.head.repo.fork)) && (github.actor != 'dependabot[bot]')
+    if: (${{ github.event.workflow_run.conclusion }} == 'success' && (github.event_name == 'push' || !(github.event.pull_request.head.repo.fork)) && (github.actor != 'dependabot[bot]'))
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -63,8 +78,17 @@ jobs:
         with:
           credentials_json: '${{ secrets.GCP_SA_KEY }}'
       - uses: google-github-actions/setup-gcloud@v2
-      - run: yarn install
-      - run: yarn build
+      - name: Restore cached node_modules
+        uses: actions/cache@v4
+        id: node_modules
+        with:
+          path: "**/node_modules"
+          key: node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - run: yarn install --frozen-lockfile
+      - name: Download build archive
+        uses: actions/download-artifact@v4
+        with:
+          name: dists-${{ github.sha }}
       - name: Run health-metrics/modular-exports-binary-size test
         run: yarn modular-export-size-report
   # TODO(yifany): Enable startup times testing on CI.
diff --git a/.github/workflows/test-all.yml b/.github/workflows/test-all.yml
index 590d59d2700..feefa755eb0 100644
--- a/.github/workflows/test-all.yml
+++ b/.github/workflows/test-all.yml
@@ -19,6 +19,7 @@ on:
     workflows: ["Build"]
     types:
       - completed
+  pull_request:
 
 env:
   # make chromedriver detect installed Chrome version and download the corresponding driver
@@ -36,8 +37,8 @@ env:
 jobs:
   # Auth and Firestore are built and executed in their own jobs in an attempt to reduce flakiness.
   test-the-rest:
-    if: ${{ github.event.workflow_run.conclusion == 'success'}}
     name: (bulk) Node.js and Browser (Chrome) Tests
+    if: ${{ github.event.workflow_run.conclusion }} == 'success'
     runs-on: ubuntu-latest
     steps:
     # install Chrome first, so the correct version of webdriver can be installed by chromedriver when setting up the repo
@@ -81,8 +82,8 @@ jobs:
       continue-on-error: true
 
   test-auth:
-    if: ${{ github.event.workflow_run.conclusion == 'success' }}
     name: (Auth) Node.js and Browser (Chrome) Tests
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
     runs-on: ubuntu-latest
     steps:
       # install Chrome first, so the correct version of webdriver can be installed by chromedriver
@@ -135,8 +136,8 @@ jobs:
       continue-on-error: true
 
   test-firestore:
-    if: ${{ github.event.workflow_run.conclusion == 'success'}}
     name: (Firestore) Node.js and Browser (Chrome) Tests
+    if: ${{ github.event.workflow_run.conclusion }} == 'success'
     runs-on: ubuntu-latest
     steps:
     # install Chrome so the correct version of webdriver can be installed by chromedriver when setting up the repo
@@ -179,7 +180,7 @@ jobs:
         path-to-lcov: ./lcov-all.info
       continue-on-error: true
   test-firestore-integration:
-    if: ${{ github.event.workflow_run.conclusion == 'success'}}
+    if: ${{ github.event.workflow_run.conclusion }} == 'success'
     strategy:
       fail-fast: false
       matrix: