diff --git a/src/build.sh b/src/build.sh
index dc4d1c56a8..55db8a481f 100755
--- a/src/build.sh
+++ b/src/build.sh
@@ -82,6 +82,20 @@ if [ "$(uname)" = Linux ]; then
   fi
 fi
 
+case "$(uname)" in
+  MINGW*|MSYS*)
+    case "$(uname -m)" in
+      x86_64) PGO_NAME=win64;;
+      *) PGO_NAME=win32;;
+    esac;;
+  Darwin) PGO_NAME=mac;;
+esac
+if [ "$PGO_NAME" ]; then
+  profile=$(cat chrome/build/$PGO_NAME.pgo.txt)
+  flags="$flags
+    pgo_data_path=\"../../chrome/build/pgo_profiles/$profile\""
+fi
+
 rm -rf "./$out"
 mkdir -p out
 
diff --git a/src/get-clang.sh b/src/get-clang.sh
index 37be25bf18..f3d6321063 100755
--- a/src/get-clang.sh
+++ b/src/get-clang.sh
@@ -47,6 +47,23 @@ if [ "$ARCH" = Linux -a ! -f chrome/android/profiles/afdo.prof ]; then
   curl "$afdo_url" | bzip2 -cd >chrome/android/profiles/afdo.prof
 fi
 
+# Profiles (Windows, Mac)
+case "$ARCH" in
+  Windows)
+    case "$(uname -m)" in
+      x86_64) PGO_NAME=win64;;
+      *) PGO_NAME=win32;;
+    esac;;
+  Darwin) PGO_NAME=mac;;
+esac
+if [ "$PGO_NAME" ]; then
+  mkdir -p chrome/build/pgo_profiles
+  profile=$(cat chrome/build/$PGO_NAME.pgo.txt)
+  cd chrome/build/pgo_profiles
+  curl -LO "https://storage.googleapis.com/chromium-optimization-profiles/pgo_profiles/$profile"
+  cd ../../..
+fi
+
 # dsymutil (Mac)
 if [ "$ARCH" = Darwin ]; then
   mkdir -p tools/clang/dsymutil