这个问题我已经纠结很久了：我的服务器和数据库都很不错，为什么网站运行这么慢？
各位前辈，请你们帮忙：
服务器是阿里云ECS 1核1G 2M
数据库是阿里云RDS云数据库，速度非常快
系统是CentOS 6.5 64位
服务器是NGINX 1.6.2
PHP是5.4.38 已经安装了OPCache
网站程序是开源CMS，别人的网站基本都是秒开，所以程序没什么问题
我使用阿里云OSS储存静态文件，css、js等，速度也很快
ping一下域名基本都是在50ms
直接访问静态文件只需要100ms,所以Nginx是正常的
可是网站访问时候响应实在太慢太慢了，每点击一下都需要等待4s-5s才能返回结果，所以我坚信是PHP的处理速度太慢了，请问大神：
这种情况该如何配置、加速PHP呢？不要求像别人那样秒开了，至少不要这么差劲吧！
感谢！
回复内容：
各位前辈，请你们帮忙：
服务器是阿里云ECS 1核1G 2M
数据库是阿里云RDS云数据库，速度非常快
系统是CentOS 6.5 64位
服务器是NGINX 1.6.2
PHP是5.4.38 已经安装了OPCache
网站程序是开源CMS，别人的网站基本都是秒开，所以程序没什么问题
我使用阿里云OSS储存静态文件，css、js等，速度也很快
ping一下域名基本都是在50ms
直接访问静态文件只需要100ms,所以Nginx是正常的
可是网站访问时候响应实在太慢太慢了，每点击一下都需要等待4s-5s才能返回结果，所以我坚信是PHP的处理速度太慢了，请问大神：
这种情况该如何配置、加速PHP呢？不要求像别人那样秒开了，至少不要这么差劲吧！
感谢！
速度慢有很多种情况，比如
- DNS解析
- CDN（可能用了国外的cdn，也会导致很慢的）
- 服务器IO（阿里云的io做的不是很好，频繁的操作io，可能很慢）
- 数据库
- 当然跟访问用户的网络也有关系
可以仔细排查下。
使用 xdebug + webgrind 调试下你的 PHP 代码性能。看看代码阻塞在哪里了。比如 curl 访问其他站点阻塞了
xdebug: 获取函数的调用栈和调用时间
webgrind: 通过 web 界面展示 xdebug 的结果
你可以用Apache Bechmark 去测试下你的网站响应速度，看看是静态文件还是你的PHP处理速度慢，再决定下一步。
1.静态问题是否使用了CDN加速？
2.是否有静态化？
3.数据库是否合理建立了索引？
4.不妨发下你的网站地址，我们帮你把把脉？
参考这个
http://segmentfault.com/q/1010000002680980/a-1020000002681487
检查网页代码里是不是调用了google的东西，只要有就会很慢
升级服务器吧，1核 1G有点慢了。
我感觉，当所有外部环境都不是问题的时候，那就是事应该想想是不是自己的问题，我感觉，就是程序的问题。程序效率太低。
能否提供一下服务器ssh信息，我去围观围观。。。
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