diff --git a/.circleci/config.yml b/.circleci/config.yml
index 0e9d75ae..03793d37 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -99,20 +99,15 @@ jobs:
     steps: [ init_clang6, cmake_test_all, cmake_install_test ]
   
   # sanitize
-  sanitize-gcc7:
-    description: Build and run tests on GCC 7 and AVX 2 with a cmake sanitize build
-    executor: gcc7
-    environment: { CMAKE_FLAGS: -DSIMDJSON_BUILD_STATIC=OFF -DSIMDJSON_SANITIZE=ON, BUILD_FLAGS: "" } # gcc sanitize seems to have bugs with -j :(
-    steps: [ cmake_test_all ]
   sanitize-gcc9:
     description: Build and run tests on GCC 9 and AVX 2 with a cmake sanitize build
     executor: gcc9
-    environment: { CMAKE_FLAGS: -DSIMDJSON_BUILD_STATIC=OFF -DSIMDJSON_SANITIZE=ON }
+    environment: { CMAKE_FLAGS: -DSIMDJSON_BUILD_STATIC=OFF -DSIMDJSON_SANITIZE=ON, CTEST_FLAGS: -j4 --output-on-failure -E checkperf }
     steps: [ cmake_test_all ]
   sanitize-clang6:
     description: Build and run tests on clang 6 and AVX 2 with a cmake sanitize build
     executor: clang6
-    environment: { CMAKE_FLAGS: -DSIMDJSON_BUILD_STATIC=OFF -DSIMDJSON_SANITIZE=ON }
+    environment: { CMAKE_FLAGS: -DSIMDJSON_BUILD_STATIC=OFF -DSIMDJSON_SANITIZE=ON, CTEST_FLAGS: -j4 --output-on-failure -E checkperf }
     steps: [ init_clang6, cmake_test_all ]
   
   # dynamic
@@ -181,7 +176,6 @@ workflows:
       - clang6
 
       # full single-implementation tests
-      - sanitize-gcc7
       - sanitize-gcc9
       - sanitize-clang6
       - dynamic-gcc7