diff --git a/.gitignore b/.gitignore
index f19541928..4f117cc87 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,4 @@
 apidocs
 build
 minsize
+fastdev
diff --git a/.travis.yml b/.travis.yml
index 46a8e3eb3..59ac0d69e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,8 +21,8 @@ before_script:
     - sleep 3
 script:
     - mkdir build && cd build
-    - if [ "$CXX" == "clang++" ];then cmake ../ -GNinja -DENABLE_TESTING=TRUE -DKATIE_UTILS=ON -Wno-dev ;fi
-    - if [ "$CXX" == "g++" ];then cmake ../ -GNinja -DENABLE_TESTING=TRUE -DKATIE_UTILS=ON -DKATIE_ALLINONE=ON -Wno-dev ;fi
+    - if [ "$CXX" == "clang++" ];then cmake ../ -GNinja -DCMAKE_BUILD_TYPE=FastDev -DENABLE_TESTING=TRUE -DKATIE_UTILS=ON -Wno-dev ;fi
+    - if [ "$CXX" == "g++" ];then cmake ../ -GNinja -DCMAKE_BUILD_TYPE=FastDev -DENABLE_TESTING=TRUE -DKATIE_UTILS=ON -DKATIE_ALLINONE=ON -Wno-dev ;fi
     - ninja
 # the tests/benchmarks take more then 1-hour and Travis times out,
 # despite the documentaiton for the service claiming otherwise
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 299a305bb..091901912 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,6 +21,12 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE RelWithDebInfo)
 endif()
 
+# custom build type - speed up builds and show some additional warnings
+if(CMAKE_BUILD_TYPE STREQUAL "FastDev")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O0 -Wall")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0 -Wall")
+endif()
+
 set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules")
 set(CMAKE_AUTOMOC FALSE)
 set(CMAKE_AUTOUIC FALSE)
@@ -41,7 +47,7 @@ set(CPACK_PACKAGE_VERSION_MAJOR "4")
 set(CPACK_PACKAGE_VERSION_MINOR "9")
 set(CPACK_PACKAGE_VERSION_PATCH "0")
 set(CPACK_SET_DESTDIR TRUE)
-set(CPACK_SOURCE_IGNORE_FILES "/build/;/minsize/;/apidocs/;/.git;${CPACK_SOURCE_IGNORE_FILES}")
+set(CPACK_SOURCE_IGNORE_FILES "/build/;/minsize/;/fastdev/;/apidocs/;/.git;${CPACK_SOURCE_IGNORE_FILES}")
 set(CPACK_STRIP_FILES TRUE)
 if(NOT CMAKE_VERSION VERSION_LESS "3.1.0")
     set(CPACK_GENERATOR "TXZ")
diff --git a/mkspecs/mkspecs.cmake b/mkspecs/mkspecs.cmake
index e3b553e35..5d90f4c98 100644
--- a/mkspecs/mkspecs.cmake
+++ b/mkspecs/mkspecs.cmake
@@ -74,7 +74,7 @@ endif()
 # also affected, which KDE uses for visibility check for an example
 if(KATIE_COMPILER STREQUAL "gcc")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
-    # TODO: set CMAKE_CXX_EXTENSIONS to OFF?
+    # TODO: set CMAKE_CXX_EXTENSIONS to OFF so it does not append the flag again?
 elseif(KATIE_COMPILER STREQUAL "clang")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 endif()
diff --git a/scripts/fastdev.sh b/scripts/fastdev.sh
new file mode 100755
index 000000000..7068e7830
--- /dev/null
+++ b/scripts/fastdev.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -e
+
+cwd="$(dirname $0)"
+
+rm -rf "$cwd/../fastdev"
+mkdir -p "$cwd/../fastdev"
+cd "$cwd/../fastdev"
+
+cmake ../ -DCMAKE_BUILD_TYPE=FastDev -DCMAKE_INSTALL_PREFIX=/usr $@
+make -j$(nproc)
diff --git a/scripts/minsize.sh b/scripts/minsize.sh
index f195ae0fe..61812adb3 100755
--- a/scripts/minsize.sh
+++ b/scripts/minsize.sh
@@ -4,6 +4,7 @@ set -e
 
 cwd="$(dirname $0)"
 
+rm -rf "$cwd/../minsize"
 mkdir -p "$cwd/../minsize"
 cd "$cwd/../minsize"