diff --git a/.github/actions/build-nominatim/action.yml b/.github/actions/build-nominatim/action.yml
index 44c19a22..9bb66df3 100644
--- a/.github/actions/build-nominatim/action.yml
+++ b/.github/actions/build-nominatim/action.yml
@@ -4,22 +4,25 @@ runs:
     using: "composite"
 
     steps:
-            - name: Install prerequisits
-              run: sudo apt-get install -y -qq libboost-system-dev libboost-filesystem-dev libexpat1-dev zlib1g-dev libbz2-dev libpq-dev libproj-dev postgresql-13-postgis-3 postgresql-13-postgis-3-scripts postgresql-server-dev-13 python3-psycopg2 python3-pyosmium
-              shell: bash
+        - name: Install prerequisits
+          run: sudo apt-get install -y -qq libboost-system-dev libboost-filesystem-dev libexpat1-dev zlib1g-dev libbz2-dev libpq-dev libproj-dev python3-psycopg2 python3-pyosmium
+          shell: bash
 
-            - name: Configure
-              run: mkdir build && cd build && cmake ..
-              shell: bash
+        - name: Configure
+          run: mkdir build && cd build && cmake ..
+          shell: bash
 
-            - name: Build
-              run: |
-                  make -j2 all
-                  ./utils/setup.php --setup-website
-              shell: bash
-              working-directory: build
+        - name: Build
+          run: |
+              make -j2 all
+              ./utils/setup.php --setup-website
+          shell: bash
+          working-directory: build
 
-            - name: Download dependencies
-              run: wget -O data/country_osm_grid.sql.gz https://www.nominatim.org/data/country_grid.sql.gz
-              shell: bash
+        - name: Download dependencies
+          run: |
+              if [ ! -f data/country_osm_grid.sql.gz ]; then
+                  wget --no-verbose -O data/country_osm_grid.sql.gz https://www.nominatim.org/data/country_grid.sql.gz
+              fi
+          shell: bash
 
diff --git a/.github/actions/setup-postgresql/action.yml b/.github/actions/setup-postgresql/action.yml
new file mode 100644
index 00000000..a5716be5
--- /dev/null
+++ b/.github/actions/setup-postgresql/action.yml
@@ -0,0 +1,24 @@
+name: 'Setup Postgresql and Postgis'
+
+runs:
+    using: "composite"
+
+    steps:
+        - name: Install postgis
+          run: sudo apt-get install -y -qq postgresql-13-postgis-3 postgresql-13-postgis-3-scripts postgresql-server-dev-13
+          shell: bash
+
+        - name: Adapt postgresql configuration
+          run: |
+              echo 'fsync = off' | sudo tee /etc/postgresql/13/main/conf.d/local.conf
+              echo 'synchronous_commit = off' | sudo tee -a /etc/postgresql/13/main/conf.d/local.conf
+              echo 'full_page_writes = off' | sudo tee -a /etc/postgresql/13/main/conf.d/local.conf
+              echo 'shared_buffers = 1GB' | sudo tee -a /etc/postgresql/13/main/conf.d/local.conf
+          shell: bash
+
+        - name: Setup database
+          run: |
+              sudo systemctl start postgresql
+              sudo -u postgres createuser -S www-data
+              sudo -u postgres createuser -s runner
+          shell: bash
diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index c0db57b2..79830673 100644
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -11,6 +11,20 @@ jobs:
               with:
                   submodules: true
 
+            - name: Get Date
+              id: get-date
+              run: |
+                  echo "::set-output name=date::$(/bin/date -u "+%Y%W")"
+              shell: bash
+
+            - uses: actions/cache@v2
+              with:
+                  path: |
+                      data/country_osm_grid.sql.gz
+                      monaco-latest.osm.pbf
+                  key: nominatim-data-${{ steps.get-date.outputs.date }}
+
+            - uses: ./.github/actions/setup-postgresql
             - uses: ./.github/actions/build-nominatim
 
             - name: Install test prerequsites
@@ -21,13 +35,6 @@ jobs:
             - name: PHP linting
               run: phpcs --report-width=120 .
 
-            - name: Setup database
-              run: |
-                  sudo systemctl start postgresql
-                  sudo -u postgres createuser -S www-data
-                  sudo -u postgres createuser -s runner
-              shell: bash
-
             - name: PHP unit tests
               run: phpunit ./
               working-directory: test/php
@@ -44,24 +51,35 @@ jobs:
               with:
                   submodules: true
 
-            - uses: ./.github/actions/build-nominatim
-
-            - name: Download test extract
-              run: wget --no-verbose https://download.geofabrik.de/europe/monaco-latest.osm.pbf
-
-            - name: Setup database
+            - name: Get Date
+              id: get-date
               run: |
-                  sudo systemctl start postgresql
-                  sudo -u postgres createuser -S www-data
-                  sudo -u postgres createuser -s runner
+                  echo "::set-output name=date::$(/bin/date -u "+%Y%W")"
               shell: bash
 
-            - name: Create configuartion
+            - uses: actions/cache@v2
+              with:
+                  path: |
+                      data/country_osm_grid.sql.gz
+                      monaco-latest.osm.pbf
+                  key: nominatim-data-${{ steps.get-date.outputs.date }}
+
+            - uses: ./.github/actions/setup-postgresql
+            - uses: ./.github/actions/build-nominatim
+
+            - name: Create configuration
               run: |
                    echo '<?php' > settings/local.php
                    echo " @define('CONST_Pyosmium_Binary', '/usr/lib/python3-pyosmium/pyosmium-get-changes');" >> settings/local.php
               working-directory: build
 
+            - name: Download import data
+              run: |
+                  if [ ! -f monaco-latest.osm.pbf ]; then
+                      wget --no-verbose https://download.geofabrik.de/europe/monaco-latest.osm.pbf
+                  fi
+              shell: bash
+
             - name: Import
               run: php ./utils/setup.php --osm-file ../monaco-latest.osm.pbf --osm2pgsql-cache 500 --all
               working-directory: build