diff --git a/instrumentation/MockInstrumentationWalker.cpp b/instrumentation/MockInstrumentationWalker.cpp
index 0ced2f0..cb991c2 100644
--- a/instrumentation/MockInstrumentationWalker.cpp
+++ b/instrumentation/MockInstrumentationWalker.cpp
@@ -91,9 +91,7 @@ uint32_t MockInstrumentationWalker::mockWalk() noexcept {
     return 1U; // failed
   } else {
     wasm::ModuleUtils::iterDefinedFunctions(*module, [this](wasm::Function *const func) noexcept {
-      if (!std::regex_match(func->name.str.begin(), func->name.str.end(), functionFilter)) {
-        walkFunctionInModule(func, this->module);
-      }
+      walkFunctionInModule(func, this->module);
     });
     return 0U;
   }
diff --git a/instrumentation/MockInstrumentationWalker.hpp b/instrumentation/MockInstrumentationWalker.hpp
index aedf2e3..f45f009 100644
--- a/instrumentation/MockInstrumentationWalker.hpp
+++ b/instrumentation/MockInstrumentationWalker.hpp
@@ -4,7 +4,6 @@
 #include <cstddef>
 #include <cstdint>
 #include <iostream>
-#include <regex>
 #include <string_view>
 #include <utility>
 #include <vector>
@@ -139,7 +138,6 @@ class MockInstrumentationWalker final : public wasm::PostWalker<MockInstrumentat
 private:
   wasm::Module *const module;  ///< working module
   const std::string checkMock; ///< mock check string
-  const std::regex functionFilter = std::regex("~lib/.+");
   wasm::Builder moduleBuilder; ///< module builder
   uint32_t expectIndex = 0U;   ///< expectation index, auto increase
   wasm::ExpressionStack expressionStack;
diff --git a/package.json b/package.json
index c497c4d..5f2126a 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "build": "node scripts/build_instrumentation.js && tsc --build ./transform/tsconfig.json && tsc --build ./src/tsconfig.json",
     "test:as": "node bin/as-test.js",
     "test:ts": "cross-env NODE_OPTIONS=--experimental-vm-modules jest",
-    "test:cpp": "cmake -B build -S . && cmake --build build --target wasm-instrumentation-test wasm-opt && build/bin/wasm-instrumentation-test",
+    "test:cpp": "cmake -B build -S . && cmake --build build --parallel 4 --target wasm-instrumentation-test wasm-opt && build/bin/wasm-instrumentation-test",
     "test": "npm run test:as && npm run test:ts && npm run test:cpp",
     "lint": "eslint src assembly tests/ts/test --max-warnings=0 && prettier -c .",
     "lint:fix": "eslint src assembly --fix && prettier --write .",
diff --git a/scripts/build_instrumentation.js b/scripts/build_instrumentation.js
index 466f513..e10ec3f 100644
--- a/scripts/build_instrumentation.js
+++ b/scripts/build_instrumentation.js
@@ -19,7 +19,7 @@ function initEmscripten() {
 initEmscripten();
 
 execSync("emcmake cmake -B build_wasm -S .", { encoding: "utf8", stdio: "inherit", env });
-execSync("cmake --build build_wasm --target wasm-instrumentation", {
+execSync("cmake --build build_wasm --parallel 4 --target wasm-instrumentation", {
   encoding: "utf8",
   stdio: "inherit",
   env,