主要有以下四点，最后一点可以最后处理。
1. ＰＣ首页静态化
2. 商品列表页ＳＱＬ优化，目前请求时间过长
3. JS CSS IMG图片URL的域名使用多个域名。
4. 提交订单那里速度慢
### ＰＣ首页静态化
后台可刷新首页静态文件。
可通过控制器cache功能实现
### 商品列表页ＳＱＬ优化，目前请求时间过长
查寻SQL慢日志存在
下午13点左右有一批慢SQL，如下：
# Time: 2018-07-10T05:18:00.074570Z
# User@Host: local[local] @ [192.168.0.23] Id: 1384379
# Query_time: 1.169958 Lock_time: 0.000266 Rows_sent: 3 Rows_examined: 528
SET timestamp=1531199880;
SELECT SQL_CALC_FOUND_ROWS common_id
FROM yf_goods_common
WHERE 1
AND shop_id IN (5,6,7,8,9,10,11,12,13,14,15,16,17,21,23,24,25,26,27,28,29,31,32,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,57,58,59,60,61,62,64,65,66,67,68,69,70,71,72,73,74,76,77,78,80,81,83,84,85,86,87,88,89,90,91,92,93,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,153,154,155,156,157,158,160,161,162,163,164,165,166,169,170,171,173,174,175,176,177,178,180,182,183,184,185,186,189,190,191,192,193,195,196,198,199,200,201,202,203,204,206,207,208,209,210,211,212,213,214,216,217,218,220,221,223,224,226,228,234,235,238,239,241,243,245,246,248,249,250,251,252,254,256)
AND transport_area_id IN (13,1,2,5,11,16,18,19,20,21,22,24,26,27,28,30,31,32,33,36,37,38,39,41,42,43,44,45,46,48,49,50,51,52,53,55,57,58,59,60,61,64,65,67,68,69,70,72,74,75,81,82,83,84,85,86,89,90,91,92,96,100,101,102,103,107,109,111,116,0)
AND shop_status=3
AND common_state=1
AND common_verify=1
AND common_id NOT IN (30,361,488,605,907,910,924,927,928,937,962,968,969,972,2121,2157,2159,2164,2217,2229,2260,2346,2371,2406,2410,2427,2478,2486,2487,2492)
ORDER BY common_salenum DESC LIMIT 0, 3;
### JS CSS IMG图片URL的域名使用多个域名。
在index.php 入口文件那里，Yf_App::start();
使用ob_start() 取得内容。
单独写一个类，把当前的HTML内容获取到。
使用正则取得图片地址，JS CSS地址。
后台配置了如10个域名，那么自动轮询到每个地址上，加快网站访问
### 提交订单那里速度慢．
