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What is Drupal based on?
Drupal is based on the Presentation Abstraction Control architecture, or PAC. The menu system acts as the Controller.
What is tag based caching?
Cache tags provide a declarative way to track which cache items depend on some data managed by Drupal. This is essential for a content management system/framework like Drupal because the same content can be reused in many ways. In any of the places where the content is used, it may be cached.
Do all caches require tags?
Every cache block has associated with it at least the Modify and Valid bits, and a tag address. The Valid bit says if the cache block is used (has valid data) or is unused. Note that an optimized cache will take shortcuts, as compared to the state transitions below.
What do you need to know about Drupal caching?
It is recommended that block and page caching be enabled. Instead of Drupal dynamically performing complex SQL queries it caches these for quick retrieval. If you enabled caching, remember, you may need to Flush Cache (Clear all caches button) to see any changes made to your site.
Read documentation for using Varnish with cache tags. Comprehensive use of cache tags across Drupal 8 allows Drupal 8 to ship with its Internal Page Cache enabled by default. This is nothing more than a built-in reverse proxy.
How is Memcached used to improve Drupal performance?
Memcached allows you to allocate memory where you have more than you need and make it accessible to areas where you have less than you need. When implemented with Drupal, Memcached can store the result of your database query’s in the memory for a specified time, reducing database traffic.
Which is the best http acceleration for Drupal?
HTTP acceleration, or Web Server (Proxy) Caching, will significantly reduce resource requirements and page load times. Varnish Cache, is a widely-used HTTP accelerator for Drupal sites. HTTP acceleration is handled by a reverse proxy.