作为Nginx组件，ngx_pagespeed将重写你的网页，让用户以更快的速度进行访问。重写的工作包括压缩图片、缩减CSS和JavaScript、扩展缓存时间，同样还包括其它一些最佳实践：

• 优化缓存——整合应用程序的数据和逻辑
• 最小化round-trip次数——削减连续的请求/响应周期数
• 最小化请求开销——削减上传大小
• 最小化负载大小——削减响应、下载及缓存页面大小
• 优化浏览器渲染——改善浏览器页面布局
• 移动方面的优化——优化站点移动网络和设备方面的相关特性

本文是基于LNMP环境，LNMP脚本参考：《LNMP最新源码安装脚本》
持续更新文章：http://blog.linuxeye.com/318.html
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下载解压PageSpeed模块

cd /root/lnmp/source
wget https://github.com/pagespeed/ngx_pagespeed/archive/release-1.6.29.3-beta.zip
unzip -q release-1.6.29.3-beta
wget https://dl.google.com/dl/page-speed/psol/1.6.29.3.tar.gz
tar xzf 1.6.29.3.tar.gz -C ngx_pagespeed-release-1.6.29.3-beta

查看线上版本编译参数

# /usr/local/nginx/sbin/nginx -V
nginx version: nginx/1.4.1
built by gcc 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC)
TLS SNI support enabled
configure arguments: --prefix=/usr/local/nginx --user=www --group=www --with-http_stub_status_module --with-http_ssl_module

增加ngx_pagespeed模块重新编译

# wget http://nginx.org/download/nginx-1.4.2.tar.gz
# tar -xvzf nginx-1.4.2.tar.gz
# cd nginx-1.4.2/
# ./configure --prefix=/usr/local/nginx --user=www --group=www --with-http_stub_status_module --with-http_ssl_module --add-module=../ngx_pagespeed-release-1.6.29.3-beta/
# make //注意只make 不要make install (如果报错请看下面)

安装ngx_pagespeed (make) 可能会报如下错误

../ngx_pagespeed-release-1.6.29.3-beta/psol/lib/Release/linux/ia32/pagespeed_automatic.a(104.system.o.o): In function `cv::tempfile(char const*)':
system.cpp:(.text._ZN2cv8tempfileEPKc+0x1e): warning: the use of `tmpnam' is dangerous, better use `mkstemp'
objs/addon/src/ngx_base_fetch.o: In function `net_instaweb::NgxBaseFetch::DecrefAndDeleteIfUnreferenced()':
/root/lnmp/source/nginx-1.4.2/../ngx_pagespeed-release-1.6.29.3-beta/src/ngx_base_fetch.cc:185: undefined reference to `__sync_add_and_fetch_4'
collect2: ld returned 1 exit status
make[1]: *** [objs/nginx] Error 1
make[1]: Leaving directory `/root/lnmp/source/nginx-1.4.2'
make: *** [build] Error 2

解决方法：

./configure 后面加上–with-cc-opt=’-DLINUX=2 -D_REENTRANT -D_LARGEFILE64_SOURCE -march=i686 -pthread’ ，如下：

# make clean
# ./configure --prefix=/usr/local/nginx --user=www --group=www --with-http_stub_status_module --with-http_ssl_module --add-module=../ngx_pagespeed-release-1.6.29.3-beta \
--with-cc-opt='-DLINUX=2 -D_REENTRANT -D_LARGEFILE64_SOURCE -march=i686 -pthread'
# make
# mv /usr/local/nginx/sbin/nginx /usr/local/nginx/sbin/nginx$(date +%m%d) #备份nginx原文件
# cp objs/nginx /usr/local/nginx/sbin/nginx #复制编译make后的文件覆盖nginx原文件
# /usr/local/nginx/sbin/nginx -t #检测nginx配置文件语法是否正确
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
# kill -USR2 `cat /usr/local/nginx/logs/nginx.pid` #把nginx.pid改成nginx.pid.oldbin跟着启动新的nginx
# kill -QUIT `cat /usr/local/nginx/logs/nginx.pid.oldbin` #退出旧的nignx 

使用ngx_pagespeed

# mkdir /var/ngx_pagespeed_cache
# chown www.www /var/ngx_pagespeed_cache
# cp /usr/local/nginx/conf/nginx.conf /usr/local/nginx/conf/nginx.conf$(date +%m%d) #备份nginx配置文件
# vi /usr/local/nginx/conf/nginx.conf
server {
pagespeed on;
pagespeed FileCachePath /var/ngx_pagespeed_cache;
location ~ "\.pagespeed\.([a-z]\.)?[a-z]{2}\.[^.]{10}\.[^.]+" { add_header "" ""; }
location ~ "^/ngx_pagespeed_static/" { }
location ~ "^/ngx_pagespeed_beacon$" { }
location /ngx_pagespeed_statistics { allow 127.0.0.1; deny all; }
location /ngx_pagespeed_message { allow 127.0.0.1; deny all; }
}
 
# /usr/local/nginx/sbin/nginx -t
Setting option from ("on")
Setting option from ("FileCachePath", "/var/ngx_pagespeed_cache")
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
# service nginx restart
Stopping nginx: [ OK ]
Starting nginx: Setting option from ("on")
Setting option from ("FileCachePath", "/var/ngx_pagespeed_cache") [ OK ]
# curl -I 'https://linuxeye.com/' | grep X-Page-Speed
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- 0:00:03 --:--:-- 0
X-Page-Speed: 1.4.0.0-2748

注意：

如果discuz使用了伪静态要注销掉下面部分（前面加#注销）：

#if (!-e $request_filename) {
#	return 404;
#}

使用后效果如下：

使用PageSpeed模块效果演示网站：https://linuxeye.com