diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF16.java b/core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF16.java
index 45a868560..7f5912d3a 100644
--- a/core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF16.java
+++ b/core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF16.java
@@ -27,6 +27,7 @@
 class JSONWriterUTF16
         extends JSONWriter {
     static final char[] REF_PREF = "{\"$ref\":".toCharArray();
+    static final int QUOTE2_COLON, QUOTE_COLON;
     static final int[] HEX256;
     static {
         int[] digits = new int[16 * 16];
@@ -47,6 +48,10 @@ class JSONWriterUTF16
         }
 
         HEX256 = digits;
+        char[] chars = new char[] {'\"', ':'};
+        QUOTE2_COLON = UNSAFE.getInt(chars, ARRAY_CHAR_BASE_OFFSET);
+        chars[0] = '\'';
+        QUOTE_COLON = UNSAFE.getInt(chars, ARRAY_CHAR_BASE_OFFSET);
     }
 
     protected char[] chars;
@@ -1682,8 +1687,7 @@ public final void writeName7Raw(long name) {
         }
 
         putLong(chars, off, name);
-        chars[off + 8] = quote;
-        chars[off + 9] = ':';
+        putIntUnaligned(chars, off + 8, useSingleQuote ? QUOTE_COLON : QUOTE2_COLON);
         this.off = off + 10;
     }
 
@@ -1707,8 +1711,7 @@ public final void writeName8Raw(long name) {
 
         chars[off++] = quote;
         putLong(chars, off, name);
-        chars[off + 8] = quote;
-        chars[off + 9] = ':';
+        putIntUnaligned(chars, off + 8, useSingleQuote ? QUOTE_COLON : QUOTE2_COLON);
         this.off = off + 10;
     }
 
@@ -1864,8 +1867,7 @@ public final void writeName15Raw(long name0, long name1) {
         }
 
         putLong(chars, off, name0, name1);
-        chars[off + 16] = quote;
-        chars[off + 17] = ':';
+        putIntUnaligned(chars, off + 16, useSingleQuote ? QUOTE_COLON : QUOTE2_COLON);
         this.off = off + 18;
     }
 
@@ -1889,8 +1891,7 @@ public final void writeName16Raw(long name0, long name1) {
 
         chars[off++] = quote;
         putLong(chars, off, name0, name1);
-        chars[off + 16] = quote;
-        chars[off + 17] = ':';
+        putIntUnaligned(chars, off + 16, useSingleQuote ? QUOTE_COLON : QUOTE2_COLON);
         this.off = off + 18;
     }
 
diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF8.java b/core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF8.java
index ae1c12023..09333c2f8 100644
--- a/core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF8.java
+++ b/core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF8.java
@@ -26,6 +26,7 @@
 class JSONWriterUTF8
         extends JSONWriter {
     static final byte[] REF_PREF = "{\"$ref\":".getBytes(StandardCharsets.ISO_8859_1);
+    static final short QUOTE2_COLON, QUOTE_COLON;
     static final short[] HEX256;
 
     static {
@@ -41,6 +42,10 @@ class JSONWriterUTF8
         }
 
         HEX256 = digits;
+        byte[] chars = new byte[] {'\"', ':'};
+        QUOTE2_COLON = UNSAFE.getShort(chars, ARRAY_BYTE_BASE_OFFSET);
+        chars[0] = '\'';
+        QUOTE_COLON = UNSAFE.getShort(chars, ARRAY_BYTE_BASE_OFFSET);
     }
 
     final CacheItem cacheItem;
@@ -1826,8 +1831,7 @@ public final void writeName8Raw(long name) {
 
         bytes[off] = (byte) quote;
         UNSAFE.putLong(bytes, ARRAY_BYTE_BASE_OFFSET + off + 1, name);
-        bytes[off + 9] = (byte) quote;
-        bytes[off + 10] = ':';
+        UNSAFE.putShort(bytes, ARRAY_BYTE_BASE_OFFSET + off + 9, useSingleQuote ? QUOTE_COLON : QUOTE2_COLON);
         this.off = off + 11;
     }
 
@@ -1983,8 +1987,7 @@ public final void writeName15Raw(long name0, long name1) {
 
         UNSAFE.putLong(bytes, ARRAY_BYTE_BASE_OFFSET + off, name0);
         UNSAFE.putLong(bytes, ARRAY_BYTE_BASE_OFFSET + off + 8, name1);
-        bytes[off + 16] = (byte) quote;
-        bytes[off + 17] = ':';
+        UNSAFE.putShort(bytes, ARRAY_BYTE_BASE_OFFSET + off + 16, useSingleQuote ? QUOTE_COLON : QUOTE2_COLON);
         this.off = off + 18;
     }
 
@@ -2008,8 +2011,7 @@ public final void writeName16Raw(long name0, long name1) {
         bytes[off++] = (byte) quote;
         UNSAFE.putLong(bytes, ARRAY_BYTE_BASE_OFFSET + off, name0);
         UNSAFE.putLong(bytes, ARRAY_BYTE_BASE_OFFSET + off + 8, name1);
-        bytes[off + 16] = (byte) quote;
-        bytes[off + 17] = ':';
+        UNSAFE.putShort(bytes, ARRAY_BYTE_BASE_OFFSET + off + 16, useSingleQuote ? QUOTE_COLON : QUOTE2_COLON);
         this.off = off + 18;
     }
 
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 fe008767c..a886f5b4b 100644
--- a/core/src/main/java/com/alibaba/fastjson2/util/IOUtils.java
+++ b/core/src/main/java/com/alibaba/fastjson2/util/IOUtils.java
@@ -1408,15 +1408,19 @@ public static void putInt(byte[] buf, int pos, int v) {
     public static void putInt(char[] buf, int pos, int v) {
         UNSAFE.putInt(
                 buf,
-                ARRAY_CHAR_BASE_OFFSET + (pos << 1),
+                ARRAY_CHAR_BASE_OFFSET + ((long) pos << 1),
                 BIG_ENDIAN ? Integer.reverseBytes(v) : v
         );
     }
 
+    public static void putIntUnaligned(char[] buf, int pos, int v) {
+        UNSAFE.putInt(buf, ARRAY_CHAR_BASE_OFFSET + ((long) pos << 1), v);
+    }
+
     public static void putLong(char[] buf, int pos, long v) {
         UNSAFE.putLong(
                 buf,
-                ARRAY_CHAR_BASE_OFFSET + (pos << 1),
+                ARRAY_CHAR_BASE_OFFSET + ((long) pos << 1),
                 BIG_ENDIAN ? Long.reverseBytes(v) : v
         );
     }