CentOS Apache 提高網頁傳輸效能

最近有個客戶，因為本身頻寬不足，且也沒預算升級頻寬，但卻又不斷反應網站延遲很高，試問該如何解決呢?

在頻寬不足時，想要有低延遲，的確很難
我想到的解決方式:
1.壓縮
2.快取
3.降低HTTP Request次數 (HTTP2.0)
4.使用CDN
5.減少DNS解析次數
以下網站可以測試網站傳輸效能，並且提出效能不足的解決方式
https://developers.google.com/speed/pagespeed/insights/
https://tools.pingdom.com/

Apache的設定

#vi /etc/http/conf.d/httpd.conf

#Cache
<ifModule mod_expires.c>
<Filesmatch "\.(jpg|jpeg|png|gif|js|css|swf|ico|woff|mp3)$">
ExpiresActive On
ExpiresDefault "access plus 2 days"
</Filesmatch>
</IfModule>

#Compression
<IfModule mod_deflate.c>
DeflateCompressionLevel 6
#AddOutputFilerByType DEFLATE 後面加上指定Content-Type檔案需要壓縮
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/x-javascript
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-httpd-php
</IfModule>

開啟壓縮前

開啟壓縮後

再搭配Google 推出的mod_pagespeed套件

#wget https://dl-ssl.google.com/dl/linux/direct/mod-pagespeed-stable_current_x86_64.rpm

#yum -y install at

#rpm -ivh mod-pagespeed-stable_current_x86_64.rpm

#vi /etc/httpd/conf.d/pagespeed.conf

<IfModule pagespeed_module>
 # Turn on mod_pagespeed. To completely disable mod_pagespeed, you
 # can set this to "off".
 ModPagespeed on

 # We want VHosts to inherit global configuration.
 # If this is not included, they'll be independent (except for inherently
 # global options), at least for backwards compatibility.
 ModPagespeedInheritVHostConfig on
....以下省略....

#systemctl restart httpd

透過mod_pagespeed套件再次測試