页面上下滑动的时候卡顿很严重

页面没加上上拉加载，下拉刷新的时候滑动是很流畅的，可加上之后在上下滑动页面就会出现很卡顿的现象，不知道是写法问题还是其他原因，求解

页面代码：

    <div class="mui-content mui-scroll-wrapper" id="pullrefresh">  
        <div class="mui-scroll">  
            <div class="main bgcolor-white" id="move-togger">  
                <div class="mui-slider mar-bott-list" id="mui_slider">  
                    <div class="mui-slider-group mui-slider-loop" id="carouselImgList"></div>  
                    <div class="mui-slider-indicator" id="carouselIndicatorList"></div>  
                </div>  
                <div class="public-box mar-bottom-15">  
                    <div class="index-top-button mar-bott-list">  
                        <ul class="index-top-button-navi">  
                            <li class="bgcolor-index-button-a">  
                                <img src="../images/index_button_a.png" onclick="openMenu('youxuan.html')">  
                            </li>  
                            <li class="bgcolor-index-button-b">  
                                <img src="../images/index_button_b.png" onclick="openMenu('pinpai.html')">  
                            </li>  
                            <li class="bgcolor-index-button-c">  
                                <img src="../images/index_button_c.png" onclick="openMenu('news.html')">  
                            </li>  
                            <li class="bgcolor-index-button-d">  
                                <img src="../images/index_button_d.png" onclick="openMenu('user.html')">  
                            </li>  
                        </ul>  
                    </div>  
                    <div class="index-product">  
                        <ul class="index-product-navi" id="recommendCars"></ul>  
                    </div>  
                </div>  
                <h2><span>热门车型</span></h2>  
                <div class="public-cont padd-top-title bgcolor-cont">  
                    <ul class="public-navi-link" id="preferredCars"></ul>  
                </div>  
            </div>  
        </div>  
    </div>

附一张图