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之前沒有添加驗證碼功能，提交表單的速度非常快，基本都是2秒內完成，添加在驗證碼后，要等待20~30秒才提示提交成功

服務器配置是2核4G內存，PHP8.0、MySQL5.7

怎么排查是什么原因導致的，提交速度那么慢

復制引用官方的頭部文件的代碼
<script type="text/javascript">var is_mobile_cms = '{IS_MOBILE}';var web_dir = '{WEB_DIR}';</script>
<script src="{THEME_PATH}assets/global/plugins/jquery.min.js" type="text/javascript"></script>
<script src="{THEME_PATH}assets/js/cms.js" type="text/javascript"></script>
<script src="{HOME_THEME_PATH}web/scripts/app.min.js" type="text/javascript"></script>

{php extract(dr_get_form_post_value('xunpan'))}
<form action="{$post_url}&is_show_msg=1" class="form-horizontal" method="post" name="feedback" id="myform">
 <ul>
  <li><p>Name<span>*</span></p><input name="data[title]" type="text" placeholder="Name" required="required"></li>
  <li><p>Country</p><input name="data[guojia]" type="text" placeholder="Country"></li>
  <li><p>E-mail<span>*</span></p><input name="data[email]" type="text" placeholder="E-mail" required="required"></li>
  <li><p>Tel</p><input name="data[dianhua]" type="text" placeholder="Tel"></li>
  <li><p>Company</p><input name="data[gongsi]" type="text" placeholder="Company"></li>
  <li><p>Message<span>*</span></p><textarea name="data[neirong]" placeholder="Message" required="required"></textarea></li>
  {if $is_post_code}
{dr_lang('Type the code')}
<input type="text" name="code">
{dr_code(120, 66)}

{/if}
  <li> <button  type="button" onclick="dr_ajax_submit('{$post_url}', 'myform', '2000', '{$rt_url}')" >Submit</button></li>
         
  </ul>
</form>