If you look at the Cache Images plugin’s thumbnails page on the WordPress plugin directory it looks like this feature already exists within the plugin. In the admin section of your site go to Settings→Media there should be an option to cache images when posts are saved.
Generally speaking your apc.shm_size should be double your highest seen used amount. You want to try and prevent your cache full count from being higher than 0. You might want to also lower some of your ttls. I’m working with someone on AWS EC2 with 5 vhosts and we had to raise apc.shm_size to 512M … Read more
wp_schedule_event is only run when your site is visited and the scheduled time has past. If varnish is serving a non expired cached page then your visitor is not hitting WordPress. Schedules a hook which will be executed by the WordPress actions core on a specific interval, specified by you. The action will trigger when … Read more
Yeah that’s definitely a caching issue. The code you have there should handle it but you can’t really guarantee anything. Do you have a caching plugin installed? If so try disabling that. Also in your wp-config.php file see if you have this define(‘WP_CACHE’, true); if so change it to false. If it isn’t there add … Read more
There is several of Cacheing plugins and tweaking available for WordPress. Some plugins that i recommend for cache is: Wp Super Cache and Quick Cache Description of Wp Super Cache: This plugin generates static html files from your dynamic WordPress blog. After a html file is generated your webserver will serve that file instead of … Read more
The Codex page for the Object Cache class holds the answer to this: By default, the object cache is non-persistent. This means that data stored in the cache resides in memory only and only for the duration of the request. Cached data will not be stored persistently across page loads unless you install a persistent … Read more
Yes, you can serve HTML through CloudFront as long as you don’t mind every user getting the same content until the cache expires. It completely depends how your caches are being stored. I can’t imagine a CDN that would not support this. They might not advertise it since many web sites are dynamic and can’t … Read more
Keeping the answer within the wordpress realm, your best bet is to install W3TC and use that plugin to optimize your speed. Even with the default settings you’d already be gaining a lot. If you want to delve further you can keep tweaking the settings within the plugin. The next step to take would be … Read more
If I visit your first link and look at the response, I get a 500 Internal Server Error when trying to get the following resource: http://designportugal.net/wp-content/themes/dt-nimble/timthumb.php?src=/wp-content/uploads/2012/11/drpedrocoelho.png&zc=1&w=30&h=30 so my guess is that your problem is with the timthumb plugin. Try disabling the plugin and see if your error goes away.
Are you running WordPress 3.5? If not, you should try upgrading because the stability of the blog-switching functionality has been greatly improved in this version: Multisite’s switch_to_blog() is now significantly faster and more reliable Once you have done this, try using the trunk version of the Memcached Object Cache plugin which adds support for the … Read more