diff --git a/benchmark/pom.xml b/benchmark/pom.xml
index 91edfe022f..e653a1eef1 100644
--- a/benchmark/pom.xml
+++ b/benchmark/pom.xml
@@ -22,11 +22,6 @@
     </properties>
 
     <dependencies>
-        <dependency>
-            <groupId>com.alibaba.fastjson2</groupId>
-            <artifactId>fastjson2-codegen</artifactId>
-            <version>${project.version}</version>
-        </dependency>
         <dependency>
             <groupId>com.alibaba.fastjson2</groupId>
             <artifactId>fastjson2-extension</artifactId>
diff --git a/benchmark/src/main/java/com/alibaba/fastjson2/benchmark/BytesAsciiCheck.java b/benchmark/src/main/java/com/alibaba/fastjson2/benchmark/BytesAsciiCheck.java
index 1136e727e8..5c990aacf9 100644
--- a/benchmark/src/main/java/com/alibaba/fastjson2/benchmark/BytesAsciiCheck.java
+++ b/benchmark/src/main/java/com/alibaba/fastjson2/benchmark/BytesAsciiCheck.java
@@ -1,5 +1,6 @@
 package com.alibaba.fastjson2.benchmark;
 
+import com.alibaba.fastjson2.JSONException;
 import com.alibaba.fastjson2.benchmark.eishay.EishayParseBinaryArrayMapping;
 import com.alibaba.fastjson2.util.JDKUtils;
 import org.apache.commons.io.IOUtils;
@@ -11,68 +12,110 @@
 import org.openjdk.jmh.runner.options.OptionsBuilder;
 
 import java.io.InputStream;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
 import java.util.concurrent.TimeUnit;
 
-import static com.alibaba.fastjson2.util.JDKUtils.ARRAY_BYTE_BASE_OFFSET;
-import static com.alibaba.fastjson2.util.JDKUtils.UNSAFE;
-
 public class BytesAsciiCheck {
     static byte[] bytes;
+    static char[] chars;
+    static String str;
+    static final MethodHandle INDEX_OF_CHAR;
 
     static {
+        MethodHandle indexOfChar = null;
+        try {
+            try {
+                Class<?> cStringLatin1 = Class.forName("java.lang.StringLatin1");
+                MethodHandles.Lookup lookup = JDKUtils.trustedLookup(cStringLatin1);
+                indexOfChar = lookup.findStatic(
+                        cStringLatin1,
+                        "indexOfChar",
+                        MethodType.methodType(int.class, byte[].class, int.class, int.class, int.class));
+            } catch (Throwable ignored) {
+                // ignore
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        INDEX_OF_CHAR = indexOfChar;
         try {
             InputStream is = EishayParseBinaryArrayMapping.class.getClassLoader().getResourceAsStream("data/eishay.json");
-            String str = IOUtils.toString(is, "UTF-8");
+            str = IOUtils.toString(is, "UTF-8");
             bytes = str.getBytes();
+            chars = str.toCharArray();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
 
-    @Benchmark
+//    @Benchmark
     public void handler(Blackhole bh) throws Throwable {
         bh.consume(
                 JDKUtils.METHOD_HANDLE_HAS_NEGATIVE.invoke(bytes, 0, bytes.length)
         );
     }
 
-    @Benchmark
+//    @Benchmark
     public void lambda(Blackhole bh) throws Throwable {
         bh.consume(
                 JDKUtils.PREDICATE_IS_ASCII.test(bytes)
         );
     }
 
-    @Benchmark
+    // @Benchmark
     public void direct(Blackhole bh) throws Throwable {
         bh.consume(hasNegatives(bytes, 0, bytes.length));
     }
 
+//    @Benchmark
+    public void isASCII(Blackhole bh) throws Throwable {
+        bh.consume(com.alibaba.fastjson2.util.IOUtils.isASCII(bytes, 0, bytes.length));
+    }
+
     @Benchmark
-    public void direct8(Blackhole bh) throws Throwable {
-        bh.consume(hasNegatives_8(bytes, 0, bytes.length));
+    public void isLatin1(Blackhole bh) throws Throwable {
+        bh.consume(com.alibaba.fastjson2.util.IOUtils.isLatin1(chars, 0, chars.length));
     }
 
-    public static boolean hasNegatives(byte[] ba, int off, int len) {
-        for (int i = off; i < off + len; i++) {
-            if (ba[i] < 0) {
-                return true;
-            }
-        }
-        return false;
+    @Benchmark
+    public void isASCIIJDK(Blackhole bh) throws Throwable {
+        bh.consume(com.alibaba.fastjson2.util.JDKUtils.PREDICATE_IS_ASCII.test(bytes));
     }
 
-    public static boolean hasNegatives_8(byte[] bytes, int off, int len) {
-        int i = off;
-        while (i + 8 <= off + len) {
-            if ((UNSAFE.getLong(bytes, ARRAY_BYTE_BASE_OFFSET + i) & 0x8080808080808080L) != 0) {
-                return true;
-            }
-            i += 8;
+    @Benchmark
+    public void indexOfSlash(Blackhole bh) throws Throwable {
+        bh.consume(com.alibaba.fastjson2.util.IOUtils.indexOfSlash(bytes, 0, bytes.length));
+    }
+
+    @Benchmark
+    public void indexOfSlashV(Blackhole bh) throws Throwable {
+        bh.consume(com.alibaba.fastjson2.util.IOUtils.indexOfSlashV(bytes, 0, bytes.length));
+    }
+
+    @Benchmark
+    public void indexOfChar(Blackhole bh) throws Throwable {
+        bh.consume(indexOfChar(bytes, '\'', 0, bytes.length));
+    }
+
+    @Benchmark
+    public void indexOfString(Blackhole bh) throws Throwable {
+        bh.consume(str.indexOf('\\'));
+    }
+
+    private static int indexOfChar(byte[] bytes, int ch, int fromIndex, int toIndex) {
+        try {
+            return (int) INDEX_OF_CHAR.invokeExact(bytes, ch, fromIndex, toIndex);
+        } catch (Throwable ignored) {
+            throw new JSONException("");
         }
+    }
 
-        for (; i < off + len; i++) {
-            if (bytes[i] < 0) {
+    public static boolean hasNegatives(byte[] ba, int off, int len) {
+        for (int i = off; i < off + len; i++) {
+            if (ba[i] < 0) {
                 return true;
             }
         }
@@ -85,6 +128,7 @@ public static void main(String[] args) throws Exception {
                 .mode(Mode.Throughput)
                 .timeUnit(TimeUnit.MILLISECONDS)
                 .warmupIterations(3)
+                .threads(1)
                 .forks(1)
                 .build();
         new Runner(options).run();
diff --git a/benchmark/src/main/java/com/alibaba/fastjson2/benchmark/wast/IOUtilsBench.java b/benchmark/src/main/java/com/alibaba/fastjson2/benchmark/wast/IOUtilsBench.java
new file mode 100644
index 0000000000..863c10a7d4
--- /dev/null
+++ b/benchmark/src/main/java/com/alibaba/fastjson2/benchmark/wast/IOUtilsBench.java
@@ -0,0 +1,45 @@
+package com.alibaba.fastjson2.benchmark.wast;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.infra.Blackhole;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+import java.util.concurrent.TimeUnit;
+
+public class IOUtilsBench {
+    static byte[] bytes;
+    static char[] chars;
+    static String str;
+
+    static {
+        StringBuilder buf = new StringBuilder();
+        for (int i = 0; i < 1000; i++) {
+            buf.append(12345678);
+        }
+        str = buf.toString();
+        bytes = str.getBytes();
+        chars = str.toCharArray();
+    }
+
+    @Benchmark
+    public void digit4(Blackhole bh) throws Throwable {
+        for (int i = 0; i < 1000; i += 8) {
+            bh.consume(com.alibaba.fastjson2.util.IOUtils.digit4(bytes, 0));
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        Options options = new OptionsBuilder()
+                .include(IOUtilsBench.class.getName())
+                .mode(Mode.Throughput)
+                .timeUnit(TimeUnit.MILLISECONDS)
+                .warmupIterations(3)
+                .threads(1)
+                .forks(1)
+                .build();
+        new Runner(options).run();
+    }
+}
diff --git a/benchmark/src/test/java/com/alibaba/fastjson2/benchmark/BytesAsciiCheckTest.java b/benchmark/src/test/java/com/alibaba/fastjson2/benchmark/BytesAsciiCheckTest.java
index cbfe501104..dbe22b821e 100644
--- a/benchmark/src/test/java/com/alibaba/fastjson2/benchmark/BytesAsciiCheckTest.java
+++ b/benchmark/src/test/java/com/alibaba/fastjson2/benchmark/BytesAsciiCheckTest.java
@@ -34,6 +34,19 @@ public static void lambda() throws Throwable {
         }
     }
 
+    public static void isASCII() throws Throwable {
+        for (int j = 0; j < 5; j++) {
+            long start = System.currentTimeMillis();
+            for (int i = 0; i < LOOP_COUNT; ++i) {
+                benchmark.isASCII(BH);
+            }
+            long millis = System.currentTimeMillis() - start;
+            System.out.println("BytesAsciiCheck-isASCII : " + millis);
+
+            // zulu17.40.19 : 118
+        }
+    }
+
     public static void direct() throws Throwable {
         for (int j = 0; j < 5; j++) {
             long start = System.currentTimeMillis();
@@ -47,14 +60,14 @@ public static void direct() throws Throwable {
         }
     }
 
-    public static void direct8() throws Throwable {
+    public static void isLatin1() throws Throwable {
         for (int j = 0; j < 5; j++) {
             long start = System.currentTimeMillis();
             for (int i = 0; i < LOOP_COUNT; ++i) {
-                benchmark.direct8(BH);
+                benchmark.isLatin1(BH);
             }
             long millis = System.currentTimeMillis() - start;
-            System.out.println("BytesAsciiCheck-direct8 : " + millis);
+            System.out.println("BytesAsciiCheck-isASCII_chars : " + millis);
 
             // zulu17.40.19 : 478
         }
@@ -75,6 +88,7 @@ public static void main(String[] args) throws Throwable {
 //        handler();
 //        lambda();
 //        direct();
-//        direct8();
+        isLatin1();
+//        isASCII();
     }
 }
diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONWriterJSONB.java b/core/src/main/java/com/alibaba/fastjson2/JSONWriterJSONB.java
index 1c400651ca..07b59d4e7f 100644
--- a/core/src/main/java/com/alibaba/fastjson2/JSONWriterJSONB.java
+++ b/core/src/main/java/com/alibaba/fastjson2/JSONWriterJSONB.java
@@ -477,7 +477,7 @@ private void writeString0(char[] chars, int coff, int strlen) {
 
             off = this.off;
         } else {
-            ascii = isASCII(chars, coff, strlen);
+            ascii = isLatin1(chars, coff, strlen);
         }
 
         int minCapacity = (ascii ? strlen : strlen * 3) + off + 6;
diff --git a/core/src/main/java/com/alibaba/fastjson2/util/IOUtils.java b/core/src/main/java/com/alibaba/fastjson2/util/IOUtils.java
index 63f7b3ae66..5b9b316faa 100644
--- a/core/src/main/java/com/alibaba/fastjson2/util/IOUtils.java
+++ b/core/src/main/java/com/alibaba/fastjson2/util/IOUtils.java
@@ -118,7 +118,7 @@ public class IOUtils {
             DIGITS_K_64[i] = c0 + v;
         }
         ZERO_DOT_LATIN1 = UNSAFE.getShort(new byte[] {'0', '.'}, ARRAY_BYTE_BASE_OFFSET);
-        ZERO_DOT_UTF16 = UNSAFE.getInt(new char[] {'0', '.'}, ARRAY_BYTE_BASE_OFFSET);
+        ZERO_DOT_UTF16 = UNSAFE.getInt(new char[] {'0', '.'}, ARRAY_CHAR_BASE_OFFSET);
     }
 
     public static void writeDigitPair(byte[] buf, int charPos, int value) {
@@ -1622,20 +1622,45 @@ public static int digit1(byte[] bytes, int off) {
     }
 
     public static int indexOfQuote(byte[] value, int quote, int fromIndex, int max) {
+        if (INDEX_OF_CHAR_LATIN1 == null) {
+            return indexOfQuote0(value, quote, fromIndex, max);
+        }
+        try {
+            return (int) INDEX_OF_CHAR_LATIN1.invokeExact(value, quote, fromIndex, max);
+        } catch (Throwable e) {
+            throw new JSONException(e.getMessage());
+        }
+    }
+    static int indexOfQuote0(byte[] value, int quote, int fromIndex, int max) {
         int i = fromIndex;
+        long address = ARRAY_BYTE_BASE_OFFSET + fromIndex;
         int upperBound = fromIndex + ((max - fromIndex) & ~7);
         long vectorQuote = quote == '\'' ? 0x2727_2727_2727_2727L : 0x2222_2222_2222_2222L;
-        while (i < upperBound && notContains(getLongLE(value, i), vectorQuote)) {
+        while (i < upperBound && notContains(UNSAFE.getLong(value, address), vectorQuote)) {
             i += 8;
+            address += 8;
         }
         return indexOfChar0(value, quote, i, max);
     }
 
     public static int indexOfSlash(byte[] value, int fromIndex, int max) {
+        if (INDEX_OF_CHAR_LATIN1 == null) {
+            return indexOfSlashV(value, fromIndex, max);
+        }
+        try {
+            return (int) INDEX_OF_CHAR_LATIN1.invokeExact(value, (int) '\\', fromIndex, max);
+        } catch (Throwable e) {
+            throw new JSONException(e.getMessage());
+        }
+    }
+
+    public static int indexOfSlashV(byte[] value, int fromIndex, int max) {
         int i = fromIndex;
+        long address = ARRAY_BYTE_BASE_OFFSET + fromIndex;
         int upperBound = fromIndex + ((max - fromIndex) & ~7);
-        while (i < upperBound && notContains(getLongLE(value, i), 0x5C5C5C5C5C5C5C5CL)) {
+        while (i < upperBound && notContains(UNSAFE.getLong(value, address), 0x5C5C5C5C5C5C5C5CL)) {
             i += 8;
+            address += 8;
         }
         return indexOfChar0(value, '\\', i, max);
     }
@@ -1710,7 +1735,7 @@ public static int getIntUnaligned(byte[] bytes, int offset) {
     }
 
     public static int getIntUnaligned(char[] bytes, int offset) {
-        return UNSAFE.getInt(bytes, ARRAY_BYTE_BASE_OFFSET + ((long) offset << 1));
+        return UNSAFE.getInt(bytes, ARRAY_CHAR_BASE_OFFSET + ((long) offset << 1));
     }
 
     public static long getLongBE(byte[] bytes, int offset) {
@@ -1723,7 +1748,7 @@ public static long getLongUnaligned(byte[] bytes, int offset) {
     }
 
     public static long getLongUnaligned(char[] bytes, int offset) {
-        return UNSAFE.getLong(bytes, ARRAY_BYTE_BASE_OFFSET + ((long) offset << 1));
+        return UNSAFE.getLong(bytes, ARRAY_CHAR_BASE_OFFSET + ((long) offset << 1));
     }
 
     public static long getLongLE(byte[] bytes, int offset) {
@@ -1733,7 +1758,7 @@ public static long getLongLE(byte[] bytes, int offset) {
 
     public static long getLongLE(char[] bytes, int offset) {
         return convEndian(false,
-                UNSAFE.getLong(bytes, ARRAY_BYTE_BASE_OFFSET + ((long) offset << 1)));
+                UNSAFE.getLong(bytes, ARRAY_CHAR_BASE_OFFSET + ((long) offset << 1)));
     }
 
     public static short hex2(int i) {
@@ -1833,19 +1858,36 @@ static short convEndian(boolean big, short n) {
         return big == BIG_ENDIAN ? n : Short.reverseBytes(n);
     }
 
-    public static boolean isASCII(char[] chars, int coff, int strlen) {
-        int i = coff;
-        for (int upperBound = coff + (strlen & ~3); i < upperBound; i += 4) {
-            if ((getLongLE(chars, i) & 0xFF00FF00FF00FF00L) != 0) {
-                return false;
-            }
+    public static boolean isLatin1(char[] chars, int off, int len) {
+        int upperBound = off + (len & ~7);
+        int end = off + len;
+        long address = ARRAY_CHAR_BASE_OFFSET + off;
+        long value = 0;
+        while (off < upperBound) {
+            value |= UNSAFE.getLong(chars, address) | UNSAFE.getLong(chars, address + 8);
+            address += 16;
+            off += 8;
         }
+        while (off++ < end) {
+            value |= UNSAFE.getShort(chars, address);
+            address += 2;
+        }
+        return (convEndian(false, value) & 0xFF00FF00FF00FF00L) == 0;
+    }
 
-        for (; i < strlen; ++i) {
-            if (chars[i] > 0x00FF) {
-                return false;
-            }
+    public static boolean isASCII(byte[] bytes, int off, int len) {
+        int upperBound = off + (len & ~7);
+        int end = off + len;
+        long address = ARRAY_BYTE_BASE_OFFSET + off;
+        long value = 0;
+        while (off < upperBound) {
+            value |= UNSAFE.getLong(bytes, address);
+            address += 8;
+            off += 8;
         }
-        return true;
+        while (off < end) {
+            value |= bytes[off++];
+        }
+        return (value & 0x8080808080808080L) == 0;
     }
 }
diff --git a/core/src/main/java/com/alibaba/fastjson2/util/JDKUtils.java b/core/src/main/java/com/alibaba/fastjson2/util/JDKUtils.java
index c600799116..a8703043db 100644
--- a/core/src/main/java/com/alibaba/fastjson2/util/JDKUtils.java
+++ b/core/src/main/java/com/alibaba/fastjson2/util/JDKUtils.java
@@ -59,6 +59,7 @@ public class JDKUtils {
 
     public static final MethodHandle METHOD_HANDLE_HAS_NEGATIVE;
     public static final Predicate<byte[]> PREDICATE_IS_ASCII;
+    public static final MethodHandle INDEX_OF_CHAR_LATIN1;
 
     static final MethodHandles.Lookup IMPL_LOOKUP;
     static volatile MethodHandle CONSTRUCTOR_LOOKUP;
@@ -340,6 +341,21 @@ public class JDKUtils {
             METHOD_HANDLE_HAS_NEGATIVE = handle;
         }
 
+        MethodHandle indexOfCharLatin1 = null;
+        if (JVM_VERSION > 9) {
+            try {
+                Class<?> cStringLatin1 = Class.forName("java.lang.StringLatin1");
+                MethodHandles.Lookup lookup = trustedLookup(cStringLatin1);
+                indexOfCharLatin1 = lookup.findStatic(
+                        cStringLatin1,
+                        "indexOfChar",
+                        MethodType.methodType(int.class, byte[].class, int.class, int.class, int.class));
+            } catch (Throwable ignored) {
+                // ignore
+            }
+        }
+        INDEX_OF_CHAR_LATIN1 = indexOfCharLatin1;
+
         Boolean compact_strings = null;
         try {
             if (JVM_VERSION == 8) {
@@ -510,20 +526,7 @@ public static String latin1StringJDK8(byte[] bytes, int offset, int strlen) {
         return STRING_CREATOR_JDK8.apply(chars, Boolean.TRUE);
     }
 
-    public static boolean isASCII(byte[] chars) {
-        int i = 0;
-        int strlen = chars.length;
-        for (int upperBound = (strlen & ~7); i < upperBound; i += 8) {
-            if ((UNSAFE.getLong(chars, ARRAY_BYTE_BASE_OFFSET + i) & 0x8080808080808080L) != 0) {
-                return false;
-            }
-        }
-
-        for (; i < strlen; ++i) {
-            if (UNSAFE.getByte(chars, ARRAY_BYTE_BASE_OFFSET + i) < 0) {
-                return false;
-            }
-        }
-        return true;
+    static boolean isASCII(byte[] chars) {
+        return IOUtils.isASCII(chars, 0, chars.length);
     }
 }
diff --git a/core/src/test/java/com/alibaba/fastjson2/util/IOUtilsTest.java b/core/src/test/java/com/alibaba/fastjson2/util/IOUtilsTest.java
index 2196bd494a..1098602d81 100644
--- a/core/src/test/java/com/alibaba/fastjson2/util/IOUtilsTest.java
+++ b/core/src/test/java/com/alibaba/fastjson2/util/IOUtilsTest.java
@@ -427,7 +427,7 @@ public void convEndian() throws Throwable {
     public void test_isASCII() {
         char[] chars = new char[] {'0', '1', '2', '3', '4', '5', '6', 0x80};
         long v = UNSAFE.getLong(chars, ARRAY_CHAR_BASE_OFFSET);
-        assertTrue(IOUtils.isASCII(chars, 0, 4));
-        assertTrue(IOUtils.isASCII(chars, 4, 4));
+        assertTrue(IOUtils.isLatin1(chars, 0, 4));
+        assertTrue(IOUtils.isLatin1(chars, 4, 4));
     }
 }
diff --git a/core/src/test/java/com/alibaba/fastjson2/util/JDKUtilsTest.java b/core/src/test/java/com/alibaba/fastjson2/util/JDKUtilsTest.java
index 8acac875ac..735520c3d2 100644
--- a/core/src/test/java/com/alibaba/fastjson2/util/JDKUtilsTest.java
+++ b/core/src/test/java/com/alibaba/fastjson2/util/JDKUtilsTest.java
@@ -4,11 +4,11 @@
 import org.junit.jupiter.api.Test;
 
 import java.lang.invoke.*;
+import java.util.Arrays;
 import java.util.function.ToIntFunction;
 
 import static com.alibaba.fastjson2.util.JDKUtils.*;
-import static org.junit.jupiter.api.Assertions.assertNotNull;
-import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.*;
 
 public class JDKUtilsTest {
     @Test
@@ -135,6 +135,13 @@ public void lookup_int() throws Throwable {
         assertNotNull(func);
     }
 
+    @Test
+    public void test_isASCII() {
+        byte[] bytes = new byte[127];
+        Arrays.fill(bytes, (byte) 'a');
+        assertTrue(isASCII(bytes));
+    }
+
     private static class PrivateBeanInt {
         private byte coder;
 
diff --git a/pom.xml b/pom.xml
index d23b335e73..58a5bbd7f9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -62,28 +62,14 @@
     </properties>
 
     <modules>
-        <!--
-        <module>adapter</module>
-        -->
         <module>benchmark</module>
-        <module>codegen</module>
-        <module>codegen-test</module>
         <module>core</module>
-        <!--
-            <module>example-graalvm-native</module>
-        -->
         <module>example-solon-test</module>
         <module>example-spring-test</module>
-        <!--
-            <module>example-spring6-test</module>
-        -->
         <module>extension</module>
         <module>extension-jaxrs</module>
         <module>extension-solon</module>
         <module>extension-spring5</module>
-        <!--
-        <module>extension-spring6</module>
-        -->
         <module>fastjson1-compatible</module>
         <module>kotlin</module>
         <module>safemode-test</module>
@@ -1033,6 +1019,16 @@
                 <module>test-jdk17</module>
             </modules>
         </profile>
+        <profile>
+            <id>enable-codegen</id>
+            <activation>
+                <jdk>(,22]</jdk>
+            </activation>
+            <modules>
+                <module>codegen</module>
+                <module>codegen-test</module>
+            </modules>
+        </profile>
         <profile>
             <id>deploy-settings</id>
             <activation>