diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8f89b2aa4..6b40132b8 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,7 +1,7 @@
 name: CI
 
 on:
-  # Run on all pull requests and all pushes to master
+  #Run on all pull requests and all pushes to master
   push:
     branches: [ master ]
   pull_request:
@@ -20,28 +20,114 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      # TODO: cache all the setup
-
       - name: Setup directories
         run: |
           # create directory that will be on the PATH
           mkdir -p ~/.local/bin
           echo "${HOME}/.local/bin" >> $GITHUB_PATH
           mkdir -p ~/source
+     
+      - uses: actions/cache@v2
+        id: cache-gcc
+        with:
+          path: ~/gcc
+          key: ${{ runner.os }}-gcc
+
+      - uses: actions/cache@v2
+        id: cache-clang
+        with:
+          path: /usr/lib/llvm-5.0/bin/clang
+          key: ${{ runner.os }}-clang
+      
+      - uses: actions/cache@v2
+        id: cache-clang-format
+        with:
+          path: /usr/bin/clang-format-5.0
+          key: ${{ runner.os }}-clang-format
+
+      - uses: actions/cache@v2
+        id: cache-libc6-i386
+        with:
+          path: /var/lib/dpkg/info/libc6-i386
+          key: ${{ runner.os }}-libc6-i386
+
+      - uses: actions/cache@v2
+        id: cache-linux-module
+        with:
+          path: /var/lib/dpkg/info/linux-modules-extra-4.15.0-20-generic
+          key: ${{ runner.os }}-linux-module
 
-      - name: Install gcc, clang, clang-format
+      - uses: actions/cache@v2
+        id: cache-make
+        with:
+          path: /usr/bin/make
+          key: ${{ runner.os }}-make
+
+      - uses: actions/cache@v2
+        id: cache-pip
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          #path: $HOME/.cache/pip                    
+
+      - uses: actions/cache@v2
+        id: cache-arm-v1
+        with:
+          path: $HOME/.arm-none-eabi-gcc-cache
+          key: ${{ runner.os }}-arm-v1
+      
+      - name: Add repo and update
         run: |
           sudo add-apt-repository ppa:ubuntu-toolchain-r/test
           sudo apt-get update
-          sudo apt-fast -y install gcc-6
-          sudo apt-fast -y install clang-5.0
-          sudo apt-fast -y install clang-format-5.0
-          sudo apt-fast -y install libc6-i386
-          # for vcan module
-          sudo apt-fast -y install linux-modules-extra-$(uname -r)
+
+      - name: Install gcc  
+        if: steps.cache-gcc.outputs.cache-hit != 'true'
+        run: sudo apt-fast -y install gcc-6
+
+      # - name: Install gcc
+      #   env:
+      #     CACHE_HIT: ${{steps.cache-gcc.outputs.cache-hit}}
+      #   run: |
+      #     if [[ "$CACHE_HIT" == 'true' ]]; then
+      #      sudo cp --force --recursive ~/gcc/* /
+      #     else
+      #       sudo apt-fast -y install gcc-6
+      #       sudo dpkg -L gcc-6 | while IFS= read -r f; do if test -f $f; then echo $f; fi; done | xargs cp --parents --target-directory ~/gcc/       
+      #       for dep in cpp-6 gcc-6-base gcc-8-base libasan3 libgcc-6-dev libmpx2; do
+      #         dpkg -L $dep | while IFS= read -r f; do if test -f $f; then echo $f; fi; done | xargs cp --parents --target-directory ~/gcc/
+      #       done
+      #     fi 
+          
+      - name: Install clang
+        if: steps.cache-clang.outputs.cache-hit != 'true'
+        run: sudo apt-fast -y install clang-5.0
+
+      - name: Install clang-format
+        if: steps.cache-clang-format.outputs.cache-hit != 'true'
+        run: sudo apt-fast -y install clang-format-5.0
+
+      - name: Install libc6-i386
+        if: steps.cache-libc6-i386.outputs.cache-hit != 'true'
+        run: sudo apt-fast -y install libc6-i386
+
+        # for vcan module
+      - name: Install linux modules
+        if: steps.cache-linux-module.outputs.cache-hit != 'true'
+        run: sudo apt-fast -y install linux-modules-extra-$(uname -r)
+
+      - name: Which gcc, clang, clang-format
+        run: |
           ln -sf `which gcc-6` ~/.local/bin/gcc
           ln -sf `which clang-5.0` ~/.local/bin/clang
           ln -sf `which clang-format-5.0` ~/.local/bin/clang-format
+  
+      - name: Make arm cache directory
+        #run: 
+          #mkdir -p /home/runner/.arm-none-eabi-gcc-cache
+        run: |
+          mkdir -p ~/.arm-none-eabi-gcc-cache
+          echo "${HOME}/.arm-none-eabi-gcc-cache" >> $GITHUB_PATH
 
       - name: Install STM32 toolchain
         env:
@@ -60,6 +146,7 @@ jobs:
           python-version: '3.x'
 
       - name: Install Python tooling
+        if: steps.cache-pip.outputs.cache-hit != 'true'
         run: |
           pip install --user virtualenv
           pip install --upgrade pip
@@ -84,11 +171,14 @@ jobs:
           clang-format --version
           .venv/bin/pip3 freeze
 
-      - name: Format and lint
-        run: |
-          make test_format
-          make lint
-          make pylint
+      - name: Format
+        run: make test_format
+
+      - name: Lint
+        run: make lint
+
+      - name: Pylint
+        run: make pylint
 
       - name: Build codegen
         run: |
@@ -128,10 +218,14 @@ jobs:
           make build_all PLATFORM=stm32f0xx DEFINE="${DEFINES}"
           make clean
 
-      - name: Build and test
-        id: build-test
-        run: |
-          make build_all PLATFORM=x86 DEFINE="${DEFINES}"
-          make test_all PLATFORM=x86 DEFINE="${DEFINES}"
-          make pytest_all
-          make build_all PLATFORM=x86 COMPILER=clang DEFINE="${DEFINES}"
+      - name: Build x86
+        run: make build_all PLATFORM=x86 DEFINE="${DEFINES}"
+
+      - name: Test x86
+        run: make test_all PLATFORM=x86 DEFINE="${DEFINES}"
+          
+      - name: Pytest
+        run: make pytest_all
+
+      - name: Build x86 with clang
+        run: make build_all PLATFORM=x86 COMPILER=clang DEFINE="${DEFINES}"