diff --git a/.travis.yml b/.travis.yml
index a741c64..a720f74 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -364,13 +364,14 @@ matrix:
               key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
 
 # clang, OS X, 64-bit
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD64=03,11,14,1z
-      osx_image: xcode9.4
-
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD64=03,11,14,1z
-      osx_image: xcode10.3
+# OS X builds are slow on Travis CI
+#    - os: osx
+#      env: TOOLSET=clang COMPILER=clang++ CXXSTD64=03,11,14,1z
+#      osx_image: xcode9.4
+#
+#    - os: osx
+#      env: TOOLSET=clang COMPILER=clang++ CXXSTD64=03,11,14,1z
+#      osx_image: xcode10.3
 
     - os: osx
       env: TOOLSET=clang COMPILER=clang++ CXXSTD64=03,11,14,17