What is cache
Websites are generally viewed hundreds, thousands, or sometimes even millions of times per month. Usually, every time a browser requests a web page, the server has to do a lot of complicated calculations and this process is time consuming.
This is done because the website will fetch the latest posts, generate headers and footers, find your site’s sidebar widgets, and so on.
However, in most cases, the results of all these calculations will be exactly the same. Wouldn’t it be great if we could make the server remember the final result instead of processing each request separately? Well, this is what caching does.
Cache can be defined as an activity where you reuse data from previous requests with the aim of speeding up future requests.
How caching works
The easiest way to understand the caching process is to look at the way a page is presented. Say you have a blog and caching is active on your blog.
The first time someone visits your homepage, they receive the page in the usual way: The request is received, processed on the server, and the resulting web page for viewing is converted into an HTML file and sent to the website visitor’s web browser.
Because caching is enabled, the server stores this HTML file – usually in random access memory (or RAM), which is very fast.
The next time you, or anyone else, revisits or visits your website’s homepage, the server doesn’t need to do any processing and conversion to HTML. Instead, they will only send the prepared HTML file to the browser.
Is caching necessary?
A well-coded website may already load in just two seconds. Isn’t that fast enough? Is cache really necessary? The answer is yes.
By using browser and server caching, you can reduce the loading time of your website by a significant amount of time. You can test the loading time before and after caching with a speed analysis tool like GTMetrix.
It’s also important to remember that, by implementing caching, you’re not only making your website load faster, you’re making it even better – and preparing it to handle unexpected traffic loads more efficiently.
Types of caching
- Client-side caching
- Browser cache
- Server-side caching
- Cache database
- Object cache
- Opcode cache
- Page cache
- Content Delivery Network (CDN) cache
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