diff --git a/test262/config.py b/test262/config.py
index 4ea7d7cefe185060fcffae1c53287dd83d905375..f2a1d8836ed8243c3ccd41292389f2bcb88a3484 100755
--- a/test262/config.py
+++ b/test262/config.py
@@ -96,5 +96,5 @@ ARK_ARCH_LIST = [
 ]
 
 DEFAULT_ARK_ARCH = ARK_ARCH_LIST[0]
-DEFAULT_OPT_LEVEL = 0
+DEFAULT_OPT_LEVEL = 2
 DEFAULT_ES2ABC_THREAD_COUNT = 0
diff --git a/ts2panda/src/cmdOptions.ts b/ts2panda/src/cmdOptions.ts
index 980ec2c5d7558392ebfbea5347c9efd48cdc6d40..bd302d1ea3f0f86c426a2a26618d598f7a637684 100644
--- a/ts2panda/src/cmdOptions.ts
+++ b/ts2panda/src/cmdOptions.ts
@@ -34,7 +34,7 @@ const ts2pandaOptions = [
     { name: 'timeout', alias: 't', type: Number, defaultValue: 0, description: "js to abc timeout threshold(unit: seconds)." },
     { name: 'opt-log-level', type: String, defaultValue: "error", description: "specifie optimizer log level. Possible values: ['debug', 'info', 'error', 'fatal']" },
     {
-        name: 'opt-level', type: Number, defaultValue: 0, description: "Optimization level. Possible values: [0, 1, 2]. Default: 0\n    0: no optimizations\n    \
+        name: 'opt-level', type: Number, defaultValue: 2, description: "Optimization level. Possible values: [0, 1, 2]. Default: 0\n    0: no optimizations\n    \
                                                                     1: basic bytecode optimizations, including valueNumber, lowering, constantResolver, regAccAllocator\n    \
                                                                     2: other bytecode optimizations, unimplemented yet"},
     { name: 'help', alias: 'h', type: Boolean, description: "Show usage guide." },
diff --git a/ts2panda/ts2abc/ts2abc.cpp b/ts2panda/ts2abc/ts2abc.cpp
index 7226eea918459837a156fced8cc81ebe32f055ac..5f79472eaa201bda3dec39c404d4ada15249b2ef 100644
--- a/ts2panda/ts2abc/ts2abc.cpp
+++ b/ts2panda/ts2abc/ts2abc.cpp
@@ -1316,11 +1316,13 @@ bool GenerateProgram([[maybe_unused]] const std::string &data, const std::string
     if (g_optLevel != static_cast<int>(OptLevel::O_LEVEL0) || optLevel != static_cast<int>(OptLevel::O_LEVEL0)) {
         optLogLevel = (optLogLevel != "error") ? optLogLevel : g_optLogLevel;
 
-        panda::Logger::ComponentMask mask;
-        mask.set(panda::Logger::Component::ASSEMBLER);
-        mask.set(panda::Logger::Component::BYTECODE_OPTIMIZER);
-        mask.set(panda::Logger::Component::COMPILER);
-        panda::Logger::InitializeStdLogging(panda::Logger::LevelFromString(optLogLevel), mask);
+        if (g_optLogLevel != "error") {
+            panda::Logger::ComponentMask mask;
+            mask.set(panda::Logger::Component::ASSEMBLER);
+            mask.set(panda::Logger::Component::BYTECODE_OPTIMIZER);
+            mask.set(panda::Logger::Component::COMPILER);
+            panda::Logger::InitializeStdLogging(panda::Logger::LevelFromString(optLogLevel), mask);
+        }
 
         bool emitDebugInfo = true;
         std::map<std::string, size_t> stat;