diff --git a/.github/workflows/conformance-tests-gax-showcase.yaml b/.github/workflows/conformance-tests-gax-showcase.yaml
index 2030178cb6c..14b687aa99e 100644
--- a/.github/workflows/conformance-tests-gax-showcase.yaml
+++ b/.github/workflows/conformance-tests-gax-showcase.yaml
@@ -7,32 +7,60 @@ on:
 permissions:
   contents: read
 jobs:
-    gapic-showcase:
-        runs-on: ubuntu-latest
-        env:
-            GAPIC_SHOWCASE_VERSION: 0.42.0
-            OS: linux
-            ARCH: amd64
-        name: GAPIC Showcase Conformance Tests
-        steps:
-        - name: Checkout code
-          uses: actions/checkout@v7
-
-        - name: Setup PHP
-          uses: shivammathur/setup-php@v2
-          with:
-            php-version: '8.2'
-            extensions: grpc-1.83.0
-
-        - name: Install and run GAPIC Showcase
-          run: |
-            curl -L https://github.com/googleapis/gapic-showcase/releases/download/v${GAPIC_SHOWCASE_VERSION}/gapic-showcase-${GAPIC_SHOWCASE_VERSION}-${OS}-${ARCH}.tar.gz | tar -zx
-            ./gapic-showcase run --port :7469 --tls --ca-cert-output-file Gax/tests/Conformance/showcase.pem &
-            sleep 2
-
-        - name: Install dependencies
-          run: |
-            composer update --prefer-dist --no-interaction --no-suggest -d Gax/
-
-        - name: Run PHPUnit
-          run: Gax/vendor/bin/phpunit -c Gax/phpunit-conformance.xml.dist
+  gapic-showcase:
+    name: GAPIC Showcase Conformance Tests
+    runs-on: ubuntu-latest
+    env:
+      GAPIC_SHOWCASE_VERSION: 0.42.0
+      OS: linux
+      ARCH: amd64
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v7
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.2'
+
+      - name: Get PHP Extension Directory
+        id: php-info
+        run: |
+          echo "ext_dir=$(php-config --extension-dir)" >> $GITHUB_OUTPUT
+          ini_dir=$(php --ini | grep "Scan this dir" | cut -d: -f2 | xargs)
+          if [ -z "$ini_dir" ]; then ini_dir="/etc/php/8.2/cli/conf.d"; fi
+          echo "ini_dir=$ini_dir" >> $GITHUB_OUTPUT
+
+      - name: Cache gRPC Extension
+        id: cache-grpc
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/grpc.so
+          key: grpc-1.83.0-php8.2-v3
+
+      - name: Install gRPC Extension
+        if: steps.cache-grpc.outputs.cache-hit != 'true'
+        run: |
+          sudo MAKEFLAGS="-j$(nproc)" pecl install grpc-1.83.0
+          mkdir -p ~/.cache
+          cp ${{ steps.php-info.outputs.ext_dir }}/grpc.so ~/.cache/grpc.so
+
+      - name: Enable gRPC Extension
+        run: |
+          sudo cp ~/.cache/grpc.so ${{ steps.php-info.outputs.ext_dir }}/grpc.so
+          echo "extension=grpc.so" | sudo tee ${{ steps.php-info.outputs.ini_dir }}/20-grpc.ini
+          php -m | grep grpc
+
+      - name: Install and run GAPIC Showcase
+        run: |
+          curl -L https://github.com/googleapis/gapic-showcase/releases/download/v${GAPIC_SHOWCASE_VERSION}/gapic-showcase-${GAPIC_SHOWCASE_VERSION}-${OS}-${ARCH}.tar.gz | tar -zx
+          ./gapic-showcase run --port :7469 --tls --ca-cert-output-file Gax/tests/Conformance/showcase.pem &
+          sleep 2
+
+      - name: Install dependencies
+        run: |
+          composer update --prefer-dist --no-interaction --no-suggest -d Gax/
+
+      - name: Run PHPUnit
+        run: Gax/vendor/bin/phpunit -c Gax/phpunit-conformance.xml.dist
+