How to increase WordPress Blog speed-decrease Page load time

There are some steps you can do as blogger to increase your WordPress CMS blog speed, in this article we mention a selected solutions to this known problem which is “Slow Page load ”:

• Enable the caching, use W3 Cache plug-in, this will increase the page load and reduce the hits on CPU and database management system.
• Remove the not needed images / scripts you read from external sites.
• Use a light theme. Default theme is ok.
• Disable and delete as many unnecessary plugins you can. Check the remaining plugins using P3 (Plugin performance profiling plugin). If you can implement a function by directly modifying the theme without using the plugin, then do it.
  
• Check your web host, if you are using shared hosting and getting big number of page views daily such as 10000 page views I suggests that you move to Virtual dedicated server, so you can grant more speed and expandability of your blogging business.
• Use Firefox Firebug module to check for error in load time.
• Decrease the number of posts shown in each page. Use smaller images (GIF and PNG)
• Use websites tool to analysis your website and measure the loading time of each components such as:
  Code:
  YSlow
  tools.pingdom.com
  https://developers.google.com/speed/pagespeed/insights
• Use Website Accelerator which uses Content Delivery Network (CDN) to cache static content from websites.
• Use compression at server side. And also use server and browser caching , from server side you can configure Apache modules(Such as pagespeed_module) usage by editing your .htaccess file:
  
  Code:
  <IfModule mod_headers.c>
  
      # 1 YEAR
  <FilesMatch "\.(ico|pdf|flv)$">
  Header set Cache-Control "max-age=29030400, public"
  </FilesMatch>
  # 1 WEEK
  <FilesMatch "\.(jpg|jpeg|png|gif|swf)$">
  Header set Cache-Control "max-age=604800, public"
  </FilesMatch>
  # 2 DAYS
  <FilesMatch "\.(xml|txt|css|js)$">
  Header set Cache-Control "max-age=604800"
  </FilesMatch>
  # 1 MIN
  <FilesMatch "\.(html|htm)$">
  Header set Cache-Control "max-age=360, private, proxy-revalidate"
  </FilesMatch>
    
  </IfModule>
   
  
  <IfModule mod_expires.c>
    # Enable expirations.
    ExpiresActive On
  
    # Cache all files for 2 weeks after access (A).
    ExpiresDefault A1209600
  
    <FilesMatch .php$>
      # Do not allow PHP scripts to be cached unless they explicitly send cache
      # headers themselves. Otherwise all scripts would have to overwrite the
      # headers set by mod_expires if they want another caching behavior. This may
      # fail if an error occurs early in the bootstrap process, and it may cause
      # problems if a non-Drupal PHP file is installed in a subdirectory.
      ExpiresActive Off
    </FilesMatch>
    
  ExpiresByType image/gif "access plus 1 month"
  ExpiresByType image/jpeg "access plus 1 month"
  ExpiresByType image/png "access plus 1 month"
  ExpiresByType text/css "access plus 1 week"
  ExpiresByType text/javascript "access plus 1 week"
  ExpiresByType application/javascript "access plus 1 week"
  ExpiresByType application/x-javascript "access plus 1 week"
  ExpiresByType image/x-icon "access plus 1 year"
  </IfModule>
  
  #FileETag INode MTime Size
  <IfModule mod_deflate.c>
  AddOutputFilterByType DEFLATE text/html
  AddOutputFilterByType DEFLATE text/css
  AddOutputFilterByType DEFLATE text/javascript
  AddOutputFilterByType DEFLATE application/javascript
  AddOutputFilterByType DEFLATE application/x-javascript
  </IfModule> 
  
  pagespeed_module :
  
  Code:
  
  
  <IfModule pagespeed_module>
    ModPagespeed on
    ModPagespeedEnableFilters extend_cache
    ModPagespeedEnableFilters collapse_whitespace
    ModPagespeedEnableFilters combine_css
    ModPagespeedEnableFilters move_css_to_head
    ModPagespeedEnableFilters remove_comments
  </IfModule>
   
  
  
• Use the latest version of WordPress and its plug-ins. (Specially if the new version includes a performance fixes)

Some of the solutions suggested are general for any website, I think that most of the webmasters start to feel a slow page speed if their websites become larger ( Large database more time) while they are using shared hosting which is cheap! yes , but in sometimes you may found your website hosted with more than 1000 websites, can you imagine this! , you can check the number of websites hosted on the same server (Same IP address and using same hardware resources) from this website :