diff --git a/bin/prof.php b/bin/prof.php
new file mode 100755
index 00000000..f8d0ceb1
--- /dev/null
+++ b/bin/prof.php
@@ -0,0 +1,8 @@
+#!/usr/bin/env php
+<?php
+if (count($argv) < 2) {
+    echo "Usage: $argv[0] elf\n";
+    exit(1);
+}
+$elf = $argv[1];
+shell_exec("pprof --pdf $elf profile.out > profile.pdf");
diff --git a/examples/EightQueue.php b/examples/EightQueue.php
index 22872c26..35023540 100644
--- a/examples/EightQueue.php
+++ b/examples/EightQueue.php
@@ -113,11 +113,13 @@ function main()
         echo "\n";
     }
 
-// 测试不同规模
+    // 测试不同规模
+    $begin = microtime(true);
     echo "\n=== 不同规模的皇后问题 ===\n";
     for ($n = 4; $n <= 10; $n++) {
         $q = new EightQueensOptimized($n);
         $count = $q->countSolutions();
         echo "{$n} 皇后问题有 {$count} 个解\n";
     }
+    echo "耗时: " . (microtime(true) - $begin) . " 秒\n";
 }
diff --git a/src/Php/AstNodeType.php b/src/Php/AstNodeType.php
index 48cb266a..4c7a8eea 100644
--- a/src/Php/AstNodeType.php
+++ b/src/Php/AstNodeType.php
@@ -4,6 +4,7 @@ namespace PhpAot\Php;
 
 use PhpParser\Node\Expr;
 use PhpParser\NodeAbstract;
+use PhpParser\Node;
 
 trait AstNodeType
 {
@@ -12,6 +13,11 @@ trait AstNodeType
         return $expr instanceof Expr\Variable;
     }
 
+    protected function isIdExpr(NodeAbstract $expr): bool
+    {
+        return $expr instanceof Node\Identifier;
+    }
+
     protected function isPropertyFetch(NodeAbstract $expr): bool
     {
         return $expr instanceof Expr\PropertyFetch;
diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index 680939d0..61956e2d 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -39,6 +39,7 @@ class CompilerBase extends \PhpAot\Core\Translator
     public const string VALUE_NAN = 'std::numeric_limits<double>::quiet_NaN()';
     public const string VALUE_INF = 'std::numeric_limits<double>::infinity()';
     public const string LITERAL_STRINGS = '_literal_strings';
+    public const string PROPERTY_OFFSETS = '_property_offsets';
     public const string EXPR_VARIABLE = 'Expr_Variable';
     public const string EXPR_NEW = 'Expr_New';
     public const string EXPR_ARRAY_DIM_FETCH = 'Expr_ArrayDimFetch';
@@ -235,12 +236,17 @@ class CompilerBase extends \PhpAot\Core\Translator
 
     protected function getFunctionName(FunctionLike $v): string
     {
-        return $this->getNativeFunctionName($this->parseIdentifier($v->name), $this->namespace, $this->class);
+        return $this->getNativeName($this->parseIdentifier($v->name), $this->namespace, $this->class);
     }
 
-    protected function getNativeFunctionName(string $fn, string $ns = '', string $class = ''): string
+    protected function getPropertyOffset(string $property, string $class, string $namespace = ''): string
     {
-        $names[] = $this->escapeFunction($fn);
+        return $this->getNativeName('property_offset_' . $property, $namespace, $class);
+    }
+
+    protected function getNativeName(string $fn, string $ns = '', string $class = ''): string
+    {
+        $names[] = $this->escapeName($fn);
         if ($ns) {
             $names[] = $this->escapeNamespace($ns);
         }
@@ -1371,7 +1377,7 @@ class CompilerBase extends \PhpAot\Core\Translator
      */
     protected function findNativeFunction(string $fname): string|false
     {
-        $possibleFunctionNames = [$this->escapeFunction($fname),];
+        $possibleFunctionNames = [$this->escapeName($fname),];
         if ($this->namespace) {
             $possibleFunctionNames[] = $this->escapeNamespace($this->namespace) . self::NAMESPACE_SEPARATOR . $fname;
         }
@@ -1918,9 +1924,9 @@ class CompilerBase extends \PhpAot\Core\Translator
         return str_replace('\\', self::NAMESPACE_SEPARATOR, strtolower($ns));
     }
 
-    protected function escapeFunction(string $fname): string
+    protected function escapeName(string $name): string
     {
-        return strtolower($fname);
+        return strtolower($name);
     }
 
     protected function escapeClass(string $class): string
@@ -2015,7 +2021,15 @@ class CompilerBase extends \PhpAot\Core\Translator
 
     protected function parsePropertyFetch(Node\Expr\PropertyFetch $expr): string
     {
-        return $this->convertToObject($expr->var) . '.getPropertyIndirect("' . $this->parseIdentifier($expr->name) . '")';
+        $object = $expr->var;
+        $property = $expr->name;
+        $id = $this->identifierToStr($property);
+        if ($this->isVarExpr($object) and $this->isIdExpr($property)) {
+            if ($this->parseIdentifier($object) === 'this_') {
+                $id = self::PREFIX . $this->getPropertyOffset($property, $this->class, $this->namespace);
+            }
+        }
+        return $this->convertToObject($object) . '.getPropertyIndirect(' . $id . ')';
     }
 
     protected function parseAssignOpShiftRight(Node $node): string
@@ -2371,7 +2385,7 @@ class CompilerBase extends \PhpAot\Core\Translator
     {
         $object = $this->convertToObject($expr->var);
         $method = $this->parseIdentifier($expr->name);
-        $nativeFunc = $this->getNativeFunctionName($method, $this->namespace, $this->class);
+        $nativeFunc = $this->getNativeName($method, $this->namespace, $this->class);
         if ($this->isNativeMethod($object, $nativeFunc)) {
             return $this->parseNativeMethodCall($object, $nativeFunc, $expr->args);
         }
diff --git a/src/Php/Translator.php b/src/Php/Translator.php
index c9ddf173..d54089e9 100644
--- a/src/Php/Translator.php
+++ b/src/Php/Translator.php
@@ -283,6 +283,13 @@ class Translator extends Preprocessor
             $lines[] = 'extern ' . self::TYPE_VAR . ' ' . $name . ';';
         }
 
+        // property offset
+        foreach ($this->classes as $classDef) {
+            foreach ($classDef->properties as $propertyDef) {
+                $lines[] = 'extern uint32_t ' . self::PREFIX . $this->getPropertyOffset($propertyDef->name, $classDef->name, $classDef->namespace) . ';';
+            }
+        }
+
         $literalStringsCount = count($this->literalStrings);
         $lines[] = 'extern php::Var ' . self::LITERAL_STRINGS . '[' . $literalStringsCount . '];' . PHP_EOL;
         $code = implode(PHP_EOL, $lines) . PHP_EOL . PHP_EOL;
@@ -446,7 +453,7 @@ class Translator extends Preprocessor
 
     protected function getNativeMethodName(ClassDef $classDef, MethodDef $methodDef): string
     {
-        return $this->getNativeFunctionName($methodDef->name, $classDef->namespace, $classDef->name);
+        return $this->getNativeName($methodDef->name, $classDef->namespace, $classDef->name);
     }
 
     protected function parseNamespace(Node\Stmt\Namespace_ $node): string
@@ -576,6 +583,8 @@ class Translator extends Preprocessor
         foreach ($classDef->methods as $method) {
             $code .= $methodCodes[$method->name] . PHP_EOL;
         }
+        $code .= PHP_EOL;
+
         return $code;
     }
 
diff --git a/src/cpp/main.cc b/src/cpp/main.cc
index e2111494..6b6ad624 100644
--- a/src/cpp/main.cc
+++ b/src/cpp/main.cc
@@ -29,7 +29,7 @@ int main(int cpp_argc, char **cpp_argv) {
 
     int rc = 0;
 #if PPROF_ON
-    ProfilerStart("myapp.prof");
+    ProfilerStart("profile.out");
 #endif
     zend_first_try {
         php_app_init();
diff --git a/src/template/extension.cc.php b/src/template/extension.cc.php
index a35d4e28..cd2a7561 100644
--- a/src/template/extension.cc.php
+++ b/src/template/extension.cc.php
@@ -43,6 +43,17 @@ foreach ($this->nativeConstants as $name => $constant):
 <?=$constant->type?> <?=$name?>;
 <?php endforeach; ?>
 
+// property offset
+<?php
+foreach ($this->classes as $classDef):
+    foreach ($classDef->properties as $propertyDef):
+?>
+uint32_t <?=Translator::PREFIX . $this->getPropertyOffset($propertyDef->name, $classDef->name, $classDef->namespace)?>;
+<?php
+    endforeach;
+endforeach;
+?>
+
 static ZEND_FUNCTION(main) {
     php_main();
 }
@@ -82,6 +93,17 @@ foreach ($this->globalVars as $name => $type):
 ?>
     <?= $name ?> = php::global("<?=$name?>");
 <?php endforeach; ?>
+
+    // property offset
+<?php
+foreach ($this->classes as $classDef):
+    foreach ($classDef->properties as $propertyDef):
+        ?>
+    <?=Translator::PREFIX . $this->getPropertyOffset($propertyDef->name, $classDef->name, $classDef->namespace)?> = php::getPropertyOffset("<?=$classDef->getNamespacedName()?>", "<?=$propertyDef->name?>");
+    <?php
+    endforeach;
+endforeach;
+?>
 }
 
 void php_app_clean() {