diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f95551d679b98..4f7cbd6a998f5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,6 +23,7 @@ name: CI
       - try-perf
       - automation/bors/try
       - master
+      - optimise-docker-cache
   pull_request:
     branches:
       - "**"
@@ -52,18 +53,8 @@ jobs:
     strategy:
       matrix:
         include:
-          - name: mingw-check
-            os: ubuntu-20.04-4core-16gb
-            env: {}
-          - name: mingw-check-tidy
-            os: ubuntu-20.04-4core-16gb
-            env: {}
-          - name: x86_64-gnu-llvm-16
-            env:
-              ENABLE_GCC_CODEGEN: "1"
-            os: ubuntu-20.04-16core-64gb
-          - name: x86_64-gnu-tools
-            os: ubuntu-20.04-16core-64gb
+          - name: temp
+            os: ubuntu-20.04
             env: {}
     timeout-minutes: 600
     runs-on: "${{ matrix.os }}"
@@ -194,128 +185,128 @@ jobs:
               - ARM64
               - linux
           - name: arm-android
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: armhf-gnu
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-aarch64-linux
             env:
               CODEGEN_BACKENDS: "llvm,cranelift"
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
           - name: dist-android
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-arm-linux
-            os: ubuntu-20.04-16core-64gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-armhf-linux
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-armv7-linux
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-i586-gnu-i586-i686-musl
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-i686-linux
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-loongarch64-linux
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-powerpc-linux
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-powerpc64-linux
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-powerpc64le-linux
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-riscv64-linux
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-s390x-linux
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-various-1
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-various-2
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-x86_64-freebsd
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-x86_64-illumos
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-x86_64-linux
             env:
               CODEGEN_BACKENDS: "llvm,cranelift"
-            os: ubuntu-20.04-16core-64gb
+            os: ubuntu-20.04
           - name: dist-x86_64-linux-alt
             env:
               IMAGE: dist-x86_64-linux
               CODEGEN_BACKENDS: "llvm,cranelift"
-            os: ubuntu-20.04-16core-64gb
+            os: ubuntu-20.04
           - name: dist-x86_64-musl
             env:
               CODEGEN_BACKENDS: "llvm,cranelift"
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
           - name: dist-x86_64-netbsd
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: i686-gnu
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: i686-gnu-nopt
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: mingw-check
-            os: ubuntu-20.04-4core-16gb
+            os: ubuntu-20.04
             env: {}
           - name: test-various
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: x86_64-gnu
-            os: ubuntu-20.04-4core-16gb
+            os: ubuntu-20.04
             env: {}
           - name: x86_64-gnu-stable
             env:
               IMAGE: x86_64-gnu
               RUST_CI_OVERRIDE_RELEASE_CHANNEL: stable
               CI_ONLY_WHEN_CHANNEL: nightly
-            os: ubuntu-20.04-4core-16gb
+            os: ubuntu-20.04
           - name: x86_64-gnu-aux
-            os: ubuntu-20.04-4core-16gb
+            os: ubuntu-20.04
             env: {}
           - name: x86_64-gnu-integration
             env:
               CI_ONLY_WHEN_CHANNEL: nightly
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
           - name: x86_64-gnu-debug
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: x86_64-gnu-distcheck
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
             env: {}
           - name: x86_64-gnu-llvm-17
             env:
               RUST_BACKTRACE: 1
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
           - name: x86_64-gnu-llvm-16
             env:
               RUST_BACKTRACE: 1
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
           - name: x86_64-gnu-nopt
-            os: ubuntu-20.04-4core-16gb
+            os: ubuntu-20.04
             env: {}
           - name: x86_64-gnu-tools
             env:
               DEPLOY_TOOLSTATES_JSON: toolstates-linux.json
-            os: ubuntu-20.04-8core-32gb
+            os: ubuntu-20.04
           - name: dist-x86_64-apple
             env:
               SCRIPT: "./x.py dist bootstrap --include-default-paths --host=x86_64-apple-darwin --target=x86_64-apple-darwin"
@@ -588,7 +579,7 @@ jobs:
           - name: dist-x86_64-linux
             env:
               CODEGEN_BACKENDS: "llvm,cranelift"
-            os: ubuntu-20.04-16core-64gb
+            os: ubuntu-20.04
     timeout-minutes: 600
     runs-on: "${{ matrix.os }}"
     steps:
diff --git a/src/ci/docker/host-x86_64/temp/Dockerfile b/src/ci/docker/host-x86_64/temp/Dockerfile
new file mode 100644
index 0000000000000..cd38b9c67fe69
--- /dev/null
+++ b/src/ci/docker/host-x86_64/temp/Dockerfile
@@ -0,0 +1,29 @@
+FROM ubuntu:22.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  g++ \
+  make \
+  ninja-build \
+  file \
+  curl \
+  ca-certificates \
+  python3 \
+  git \
+  cmake \
+  sudo \
+  gdb \
+  libssl-dev \
+  pkg-config \
+  xz-utils \
+  mingw-w64 \
+  && rm -rf /var/lib/apt/lists/*
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+ENV RUST_CONFIGURE_ARGS \
+ --build=x86_64-unknown-linux-gnu \
+ --enable-sanitizers \
+ --enable-profiler \
+ --enable-compiler-docs
\ No newline at end of file
diff --git a/src/ci/docker/run.sh b/src/ci/docker/run.sh
index bd5447ac835d9..bd26bd8f30e7a 100755
--- a/src/ci/docker/run.sh
+++ b/src/ci/docker/run.sh
@@ -7,6 +7,7 @@ export MSYS_NO_PATHCONV=1
 script=`cd $(dirname $0) && pwd`/`basename $0`
 
 image=""
+
 dev=0
 
 while [[ $# -gt 0 ]]
@@ -94,7 +95,7 @@ if [ -f "$docker_dir/$image/Dockerfile" ]; then
 
     # On non-CI or PR jobs, we don't have permissions to write to the registry cache, so we should
     # not use `docker login` nor caching.
-    if [[ "$CI" == "" ]] || [[ "$PR_CI_JOB" == "1" ]];
+    if [[ "$CI" == "" ]];
     then
         retry docker build --rm -t rust-ci -f "$dockerfile" "$context"
     else
@@ -132,6 +133,7 @@ if [ -f "$docker_dir/$image/Dockerfile" ]; then
 
         # Tag the built image and push it to the registry
         docker tag rust-ci "${IMAGE_TAG}"
+        echo ">>>>>>>>>>>>>>>>>> ${IMAGE_TAG}" 
         docker push "${IMAGE_TAG}"
 
         # Record the container registry tag/url for reuse, e.g. by rustup.rs builds
@@ -293,37 +295,39 @@ if [ "$ENABLE_GCC_CODEGEN" = "1" ]; then
   echo "Setting extra environment values for docker: $extra_env"
 fi
 
-docker \
-  run \
-  --workdir /checkout/obj \
-  --env SRC=/checkout \
-  $extra_env \
-  $args \
-  --env CARGO_HOME=/cargo \
-  --env DEPLOY \
-  --env DEPLOY_ALT \
-  --env CI \
-  --env GITHUB_ACTIONS \
-  --env GITHUB_REF \
-  --env GITHUB_STEP_SUMMARY="/checkout/obj/${SUMMARY_FILE}" \
-  --env TOOLSTATE_REPO_ACCESS_TOKEN \
-  --env TOOLSTATE_REPO \
-  --env TOOLSTATE_PUBLISH \
-  --env RUST_CI_OVERRIDE_RELEASE_CHANNEL \
-  --env CI_JOB_NAME="${CI_JOB_NAME-$IMAGE}" \
-  --env BASE_COMMIT="$BASE_COMMIT" \
-  --env DIST_TRY_BUILD \
-  --env PR_CI_JOB \
-  --env OBJDIR_ON_HOST="$objdir" \
-  --env CODEGEN_BACKENDS \
-  --init \
-  --rm \
-  rust-ci \
-  "${command[@]}"
-
-cat $objdir/${SUMMARY_FILE} >> "${GITHUB_STEP_SUMMARY}"
-
-if [ -f /.dockerenv ]; then
-  rm -rf $objdir
-  docker cp checkout:/checkout/obj $objdir
-fi
+echo "${command[@]}"
+
+# docker \
+#   run \
+#   --workdir /checkout/obj \
+#   --env SRC=/checkout \
+#   $extra_env \
+#   $args \
+#   --env CARGO_HOME=/cargo \
+#   --env DEPLOY \
+#   --env DEPLOY_ALT \
+#   --env CI \
+#   --env GITHUB_ACTIONS \
+#   --env GITHUB_REF \
+#   --env GITHUB_STEP_SUMMARY="/checkout/obj/${SUMMARY_FILE}" \
+#   --env TOOLSTATE_REPO_ACCESS_TOKEN \
+#   --env TOOLSTATE_REPO \
+#   --env TOOLSTATE_PUBLISH \
+#   --env RUST_CI_OVERRIDE_RELEASE_CHANNEL \
+#   --env CI_JOB_NAME="${CI_JOB_NAME-$IMAGE}" \
+#   --env BASE_COMMIT="$BASE_COMMIT" \
+#   --env DIST_TRY_BUILD \
+#   --env PR_CI_JOB \
+#   --env OBJDIR_ON_HOST="$objdir" \
+#   --env CODEGEN_BACKENDS \
+#   --init \
+#   --rm \
+#   rust-ci \
+#   "${command[@]}"
+
+# cat $objdir/${SUMMARY_FILE} >> "${GITHUB_STEP_SUMMARY}"
+
+# if [ -f /.dockerenv ]; then
+#   rm -rf $objdir
+#   docker cp checkout:/checkout/obj $objdir
+# fi
diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index 9b0f477409a93..9bca48c0edd47 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -77,15 +77,15 @@ x--expand-yaml-anchors--remove:
     env: {}
 
   - &job-linux-4c
-    os: ubuntu-20.04-4core-16gb
+    os: ubuntu-20.04
     <<: *base-job
 
   - &job-linux-8c
-    os: ubuntu-20.04-8core-32gb
+    os: ubuntu-20.04
     <<: *base-job
 
   - &job-linux-16c
-    os: ubuntu-20.04-16core-64gb
+    os: ubuntu-20.04
     <<: *base-job
 
   - &job-macos-xl
@@ -296,6 +296,7 @@ on:
       - try-perf
       - automation/bors/try
       - master
+      - optimise-docker-cache
   pull_request:
     branches:
       - "**"
@@ -330,19 +331,22 @@ jobs:
     strategy:
       matrix:
         include:
-          - name: mingw-check
+          - name: temp
             <<: *job-linux-4c
+          
+          # - name: mingw-check
+          #   <<: *job-linux-4c
 
-          - name: mingw-check-tidy
-            <<: *job-linux-4c
+          # - name: mingw-check-tidy
+          #   <<: *job-linux-4c
 
-          - name: x86_64-gnu-llvm-16
-            env:
-              ENABLE_GCC_CODEGEN: "1"
-            <<: *job-linux-16c
+          # - name: x86_64-gnu-llvm-16
+          #   env:
+          #     ENABLE_GCC_CODEGEN: "1"
+          #   <<: *job-linux-16c
 
-          - name: x86_64-gnu-tools
-            <<: *job-linux-16c
+          # - name: x86_64-gnu-tools
+          #   <<: *job-linux-16c
 
   auto:
     <<: *base-ci-job