diff --git a/.github/workflows/compile.yaml b/.github/workflows/compile.yaml
index b69400d..2393d27 100644
--- a/.github/workflows/compile.yaml
+++ b/.github/workflows/compile.yaml
@@ -1,7 +1,7 @@
 name: compile-slides
 'on':
   push:
-    branches: [ master, main ]
+    branches: [ master, main, 3-speed-up-ci-with-caching ]
 
 jobs:
   build:
@@ -14,6 +14,18 @@ jobs:
         submodules: true
     - name: get pu for preview
       run: sudo apt install poppler-utils
+# https://github.com/actions/cache/issues/342
+    - name: Caching
+      id: cache-slides
+      uses: actions/cache@v3
+      with:
+        path: |
+          **/build/*
+          !**/build/*.pdf
+          overview/*
+          !Overview/*.pdf
+        key: ${{ runner.os }}-eidi-ss2022-slides-v2-${{ github.run_id }}
+        restore-keys: ${{ runner.os }}-eidi-ss2022-slides-v2-
     - name: use make docker to do the magic
       run: make docker
     - name: 'compiling the pdfs'
diff --git a/data/makefile.meta b/data/makefile.meta
index fa20a20..59d3f87 100644
--- a/data/makefile.meta
+++ b/data/makefile.meta
@@ -48,8 +48,9 @@ noanim_%-dark.pdf: $(DEPENDENCIES)
 # we only make use of temporary files to do not clutter
 define produce
 	echo "${__FILECONTENT}" > "${__FILENAME}"
-	sltx raw-compile "${__FILENAME}"
+	latexmk -shell-escape -output-directory=build/ -pdf "${__FILENAME}"
 	rm "${__FILENAME}"
+	mv build/*.pdf ./
 endef
 
 clean: