diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index 30af84c296..da5a7cd60d 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -48,6 +48,8 @@ jobs:
         profile: minimal
         toolchain: stable
     - uses: Swatinem/rust-cache@v1
+    - name: set mold linker as default linker
+      uses: rui314/setup-mold@v1
     - name: Install deps
       run: sudo apt-get install -y llvm llvm-dev clang ninja-build
     - name: get clang version
@@ -107,6 +109,9 @@ jobs:
       with:
         profile: minimal
         toolchain: stable
+    - name: set mold linker as default linker
+      if: runner.os == 'Linux' # mold only support linux until now
+      uses: rui314/setup-mold@v1
     - name: add ccache 
       uses: hendrikmuhs/ccache-action@v1.2
       with:
diff --git a/scripts/test_all_fuzzers.sh b/scripts/test_all_fuzzers.sh
index 8475964d6c..4c7fa2c0a3 100755
--- a/scripts/test_all_fuzzers.sh
+++ b/scripts/test_all_fuzzers.sh
@@ -12,8 +12,20 @@ libafl=$(pwd)
 
 git submodule init && git submodule update
 
+# override default profile settings for speed
+# export RUSTFLAGS="-C prefer-dynamic"
+for profile in DEV RELEASE; # loop for all profiles
+do
+    export CARGO_PROFILE_"$profile"_OPT_LEVEL=z # optimize for size
+    export CARGO_PROFILE_"$profile"_SPLIT_DEBUGINFO=unpacked # minimize debug info
+    # export CARGO_PROFILE_"$profile"_PANIC=abort
+    export CARGO_PROFILE_"$profile"_INCREMENTAL=true
+done
+
 # record time of each fuzzer
 declare -A time_record || (echo "declare -A not avaliable, please update your bash version to 4";exit 1)
+
+
 for fuzzer in $(echo $fuzzers $backtrace_fuzzers);
 do
     cd $fuzzer