diff --git a/AvocadoAmber/_extra_font.php b/AvocadoAmber/_extra_font.php
index 8ac3541..18efe83 100644
--- a/AvocadoAmber/_extra_font.php
+++ b/AvocadoAmber/_extra_font.php
@@ -2,25 +2,82 @@
 if (!defined('_GNUBOARD_'))
   exit;
 
-$font_sql = "SELECT * FROM {$g5['font_table']} ORDER BY font_name ASC";
-$font_result = sql_query($font_sql);
+function getFontCSSWithCache()
+{
+  global $g5;
+  $cache_key = 'font_css_cache';
+  $cache_duration = 300;
 
-echo "<style id=\"extra_font\">";
-while ($row = sql_fetch_array($font_result)) {
-  $font_family = $row['font_family'];
-  $font_url = stripslashes($row['font_url']);
-  $font_weight = $row['font_weight'];
-  $font_style = $row['font_style'];
+  if (USE_REDIS && class_exists('Redis')) {
+    try {
+      $redis = new Redis();
+      $redis->connect('localhost', 6379);
 
-  if (strpos($font_url, '@import') !== false) {
-    echo "{$font_url}\n\n";
-  } else {
-    echo "@font-face {\n";
-    echo "  font-family: '{$font_family}';\n";
-    echo "  src: {$font_url};\n";
-    echo "  font-weight: {$font_weight};\n";
-    echo "  font-style: {$font_style};\n";
-    echo "}\n\n";
+      $cached_css = $redis->get($cache_key);
+      if ($cached_css !== false) {
+        $redis->close();
+        return $cached_css;
+      }
+
+      $css_content = generateFontCSS($g5);
+      $redis->setex($cache_key, $cache_duration, $css_content);
+      $redis->close();
+
+      return $css_content;
+    } catch (Exception $e) {
+      error_log("Redis 연결 실패: " . $e->getMessage());
+    }
   }
+
+  return getFontCSSWithFileCache($g5, $cache_duration);
 }
-echo "</style>";
+
+function getFontCSSWithFileCache($g5, $cache_duration)
+{
+  $cache_file = G5_DATA_PATH . '/cache/font_css_cache.txt';
+  $cache_dir = dirname($cache_file);
+
+  if (!is_dir($cache_dir)) {
+    @mkdir($cache_dir, 0755, true);
+  }
+
+  if (file_exists($cache_file) && (time() - filemtime($cache_file)) < $cache_duration) {
+    return file_get_contents($cache_file);
+  }
+
+  $css_content = generateFontCSS($g5);
+
+  @file_put_contents($cache_file, $css_content, LOCK_EX);
+
+  return $css_content;
+}
+
+function generateFontCSS($g5)
+{
+  $font_sql = "SELECT * FROM {$g5['font_table']} ORDER BY font_name ASC";
+  $font_result = sql_query($font_sql);
+  $css_content = "<style id=\"extra_font\">";
+
+  while ($row = sql_fetch_array($font_result)) {
+    $font_family = $row['font_family'];
+    $font_url = stripslashes($row['font_url']);
+    $font_weight = $row['font_weight'];
+    $font_style = $row['font_style'];
+
+    if (strpos($font_url, '@import') !== false) {
+      $css_content .= "{$font_url}\n\n";
+    } else {
+      $css_content .= "@font-face {\n";
+      $css_content .= "  font-family: '{$font_family}';\n";
+      $css_content .= "  src: {$font_url};\n";
+      $css_content .= "  font-weight: {$font_weight};\n";
+      $css_content .= "  font-style: {$font_style};\n";
+      $css_content .= "}\n\n";
+    }
+  }
+
+  $css_content .= "</style>";
+  return $css_content;
+}
+
+echo getFontCSSWithCache();
diff --git a/AvocadoAmber/adm/design_form_css.php b/AvocadoAmber/adm/design_form_css.php
index 9d02f58..83f1824 100644
--- a/AvocadoAmber/adm/design_form_css.php
+++ b/AvocadoAmber/adm/design_form_css.php
@@ -6,30 +6,12 @@ $css_sql = sql_query("SELECT * FROM {$g5['css_table']}");
 $css = [];
 for ($i = 0; $cs = sql_fetch_array($css_sql); $i++) {
   $css[$cs['cs_name']][0] = $cs['cs_value'];
-  $css[$cs['cs_name']][1] = $cs['cs_etc_1'];
-  $css[$cs['cs_name']][2] = $cs['cs_etc_2'];
-  $css[$cs['cs_name']][3] = $cs['cs_etc_3'];
-  $css[$cs['cs_name']][4] = $cs['cs_etc_4'];
-  $css[$cs['cs_name']][5] = $cs['cs_etc_5'];
-  $css[$cs['cs_name']][6] = $cs['cs_etc_6'];
-  $css[$cs['cs_name']][7] = $cs['cs_etc_7'];
-  $css[$cs['cs_name']][8] = $cs['cs_etc_8'];
-  $css[$cs['cs_name']][9] = $cs['cs_etc_9'];
-  $css[$cs['cs_name']][10] = $cs['cs_etc_10'];
-
-  $css[$cs['cs_name']][11] = $cs['cs_etc_11'];
-  $css[$cs['cs_name']][12] = $cs['cs_etc_12'];
-  $css[$cs['cs_name']][13] = $cs['cs_etc_13'];
-  $css[$cs['cs_name']][14] = $cs['cs_etc_14'];
-  $css[$cs['cs_name']][15] = $cs['cs_etc_15'];
-  $css[$cs['cs_name']][16] = $cs['cs_etc_16'];
-  $css[$cs['cs_name']][17] = $cs['cs_etc_17'];
-  $css[$cs['cs_name']][18] = $cs['cs_etc_18'];
-  $css[$cs['cs_name']][19] = $cs['cs_etc_19'];
-  $css[$cs['cs_name']][20] = $cs['cs_etc_20'];
+  for ($j = 1; $j <= 20; $j++) {
+    $css[$cs['cs_name']][$j] = $cs["cs_etc_$j"];
+  }
 }
-$tab_width = 1024;
 
+$tab_width = 1024;
 $is_item_area = false;
 $is_comment_area = false;
 
diff --git a/AvocadoAmber/classes/htmlprocess/htmlprocess.class.php b/AvocadoAmber/classes/htmlprocess/htmlprocess.class.php
index 34d6861..547afab 100644
--- a/AvocadoAmber/classes/htmlprocess/htmlprocess.class.php
+++ b/AvocadoAmber/classes/htmlprocess/htmlprocess.class.php
@@ -4,6 +4,9 @@ class html_process
   protected $latecss = [];
   protected $css = [];
   protected $js = [];
+  protected $beforeBuffer = "";
+  protected $afterBuffer = "";
+  protected $replacer = [];
 
   private function updateLoginTable()
   {
@@ -188,9 +191,24 @@ class html_process
     }*/
   }
 
+  public function appendHtml($html)
+  {
+    $this->afterBuffer .= $html;
+  }
+
+  public function prependHtml($html)
+  {
+    $this->beforeBuffer .= $html;
+  }
+
+  public function addRegexReplace($pattern, $replace)
+  {
+    $this->replacer[] = [$pattern, $replace];
+  }
+
   public function run()
   {
-    global $config, $g5, $member;
+    global $config;
 
     $this->updateLoginTable();
     $this->cleanOldLoginRecords($config['cf_login_minutes']);
@@ -203,6 +221,13 @@ class html_process
     $buffer = $this->injectStyles($buffer, $stylesheet, $latestylesheet);
     $buffer = $this->injectJavascript($buffer, $javascript);
 
+    foreach($this->replacer as $v) {
+      $buffer = preg_replace($v[0], $v[1], $buffer);
+    }
+
+    $buffer = preg_replace('#(</head>[^<]*<body[^>]*>)#', "$1{$this->beforeBuffer}", $buffer);
+    $buffer = preg_replace('#</(?:\s+)?body>#', "</body>" . $this->afterBuffer, $buffer);
+
     if (class_exists("EventHandler")) {
       EventHandler::triggerEvent("amber.renderhtml_before_print", $buffer);
     }
diff --git a/AvocadoAmber/common.php b/AvocadoAmber/common.php
index e9b0351..7cc061b 100644
--- a/AvocadoAmber/common.php
+++ b/AvocadoAmber/common.php
@@ -1,4 +1,8 @@
 <?php
+/**
+ * @suppress PHP0419
+ * @suppress PHP6405
+ */
 /*******************************************************************************
  ** 공통 변수, 상수, 코드
  *******************************************************************************/
@@ -487,12 +491,15 @@ if (!defined('G5_IS_ADMIN')) {
 @ini_set("session.use_trans_sid", 0); // PHPSESSID를 자동으로 넘기지 않음
 @ini_set("url_rewriter.tags", ""); // 링크에 PHPSESSID가 따라다니는것을 무력화함 (해뜰녘님께서 알려주셨습니다.)
 
-session_save_path(G5_SESSION_PATH);
-
-if (isset($SESSION_CACHE_LIMITER))
-  @session_cache_limiter($SESSION_CACHE_LIMITER);
-else
-  @session_cache_limiter("no-cache, must-revalidate");
+if (USE_REDIS && extension_loaded('redis')) {
+  ini_set('session.save_path', 'tcp://localhost:6379');
+} else {
+  session_save_path(G5_SESSION_PATH);
+  if (isset($SESSION_CACHE_LIMITER))
+    @session_cache_limiter($SESSION_CACHE_LIMITER);
+  else
+    @session_cache_limiter("no-cache, must-revalidate");
+}
 
 ini_set("session.cache_expire", 180); // 세션 캐쉬 보관시간 (분)
 ini_set("session.gc_maxlifetime", 10800); // session data의 garbage collection 존재 기간을 지정 (초)
diff --git a/AvocadoAmber/config.php b/AvocadoAmber/config.php
index 387df7d..61eda8b 100644
--- a/AvocadoAmber/config.php
+++ b/AvocadoAmber/config.php
@@ -2,6 +2,15 @@
 /**
  * @suppress PHP0419
  */
+// if you want use redis-session, enable it (change to true)
+define('USE_REDIS', false);
+
+if (USE_REDIS) {
+  ini_set('session.save_handler', 'redis');
+} else {
+  ini_set('session.save_handler', 'files');
+}
+
 /********************
     상수 선언
 ********************/