diff --git a/.travis.yml b/.travis.yml
index 74a1d2a..f43f599 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -215,7 +215,8 @@ matrix:
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
 
 install:
-  - BOOST_BRANCH=develop && [ "$TRAVIS_BRANCH" == "master" ] && BOOST_BRANCH=master || true
+  - BOOST_BRANCH=develop
+  - if [ "$TRAVIS_BRANCH" = "master" ]; then BOOST_BRANCH=master; fi
   - cd ..
   - git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
   - cd boost-root
@@ -240,7 +241,8 @@ install:
 script:
   - |-
     echo "using $TOOLSET : : $COMPILER ;" > ~/user-config.jam
-  - ./b2 -j3 libs/utility/test toolset=$TOOLSET cxxstd=$CXXSTD
+  - BUILD_JOBS=`(nproc || sysctl -n hw.ncpu) 2> /dev/null`
+  - ./b2 -j $BUILD_JOBS libs/utility/test toolset=$TOOLSET cxxstd=$CXXSTD
 
 notifications:
   email:
diff --git a/appveyor.yml b/appveyor.yml
index 5bf3fcc..f3f801c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -51,4 +51,4 @@ build: off
 test_script:
   - PATH=%ADDPATH%%PATH%
   - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
-  - b2 -j3 libs/utility/test toolset=%TOOLSET% %CXXSTD%
+  - b2 -j %NUMBER_OF_PROCESSORS% libs/utility/test toolset=%TOOLSET% %CXXSTD%