diff --git a/scripts/benchmark.ps1 b/scripts/benchmark.ps1
index 21d21b2..ddcbfd0 100644
--- a/scripts/benchmark.ps1
+++ b/scripts/benchmark.ps1
@@ -1,24 +1,49 @@
-# Copyright 2019 Google LLC
-
-# Licensed under the the Apache License v2.0 with LLVM Exceptions (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-
-#     https://llvm.org/LICENSE.txt
-
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-param(
-    [Parameter(Mandatory=$true)][string]$WORKDIR
-)
-
-Measure-Command { git clone --depth 1 https://github.com/llvm/llvm-project $WORKDIR }
-
-Set-Location $WORKDIR
-Measure-Command {& $PSScriptRoot\run_cmake.ps1}
-Measure-Command {& $PSScriptRoot\run_ninja.ps1 all}
-Measure-Command {& $PSScriptRoot\run_ninja.ps1 check-all}
+# Copyright 2019 Google LLC
+
+# Licensed under the the Apache License v2.0 with LLVM Exceptions (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     https://llvm.org/LICENSE.txt
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# The script will benchmark the windows build steps.
+# It can be used to optimize the build performance.
+
+param(
+    [Parameter(Mandatory=$true)][string]$WORKDIR
+)
+
+. ${PSScriptRoot}\common.ps1
+function timeit() {
+    param(
+      [scriptblock] $cmd
+    )
+    Write-Host "Running $cmd..."
+    $secs=Measure-Command @cmd | Select-Object -Property TotalSeconds
+    if ($lastexitcode -ne 0) {
+        Write-Error "$cmd failed!"
+    }
+    Write-Host "$cmd ran for $($secs.TotalSeconds)"
+    #TODO: make this an absolute path!
+    Add-Content benchmark.txt "$cmd : $($secs.TotalSeconds)"
+}
+
+Write-Host "Deleting work dir: $WORKDIR"
+& cmd /c rd /s/q $WORKDIR | Out-Null
+& cmd /c rd /s/q benchmark.txt | Out-Null
+timeit {git clone --depth 1 https://github.com/llvm/llvm-project $WORKDIR}
+Set-Location $WORKDIR
+timeit {git pull}
+
+timeit {& $PSScriptRoot\run_cmake.ps1}
+timeit {& $PSScriptRoot\run_ninja.ps1 all}
+timeit {& $PSScriptRoot\run_ninja.ps1 check-all}
+# re-run to get time for tests without compilation
+timeit {& $PSScriptRoot\run_ninja.ps1 check-all}
+timeit {& cmd /c rd/s/q $WORKDIR}