The gap between the speed of CPUs and memory meant that the CPU would often be idle. In the history of computer and electronic chip development, there was a period when increases in CPU speed outpaced the improvements in memory access speed.
4.2 Intel Kaby Lake microarchitecture (2016). 4.1 Intel Broadwell microarchitecture (2014). Google seems to prefer this caching option set to at least one week so I commonly set it to 8 days as shown in my sample image.Ĭlick OK to save the settings and you’re all done! You can test your site using browser (IE or Chrome) developer tools to confirm the headers, or use an external testing site to confirm the caching. Choose the radio button for “After” then set a date range. Once you check that box you’ll see that it defaults to expiring the content immediately… which is not helpful at all. Let’s pay attention to the Expire Web Content option which isn’t selected by default. The HTTP Keep-alive should be already selected by default – leave that alone. Open "HTTPS response headers", Go to Actions panel on right side click on "Set Common header" The interface and steps are basically the same, but I’ll show screenshots of making the change just on the \images\ folder of my site:Ģ. You can control the caching either for the entire site or for specific folders. Sure, even the smallest of servers can commonly handle hundreds if not thousands of concurrent visitors, but hey, why make it do all that work if it doesn’t need to? Imagine if your content is all cached and you have a 50% new vs returning visitor ratio… that means that your site load would potentially be cut in half, and the server could handle twice as many visitors before needing a resource upgrade.ġ. open the IIS Manager on your server, expand the Sites folder and then find the site you want to manage. If something is loaded from cache rather than from the server, that cuts down on the number of requests that the site needs to satisfy. This would be especially important in sites that are image-heavy like perhaps storefronts that show images of varying size and quality for their products. In a case where bandwidth is tracked and allocated on a monthly data transfer plan, this means less overall usage and potentially fewer costs for your hosting. If the data is pulled from cache rather than the server, that obviously means less data being transferred. Site load time has shown to have a large impact on visitor interaction with websites. And the faster the visitor’s browsing experience is, the better the overall experience and site impression will be. If the page, or at least parts of the page, are loaded from cache, that is always going to display faster than a round-trip to the server. Google’s various page speed testing tools seem to prefer browser caching set with at least a one-week expiration set. In addition to enabling output caching, you must also set up output cache rules to specify how you want content to be cached. This will let you avoid making a call to the database every time that a particular Web page is requested. For example, you might want to enable caching if your application retrieves information from a database. 
You should enable output caching if your site or application content requires complex or lengthy processing. Caching decreases the amount of processing time for requests made to your site or application by returning a processed copy of a Web page from the cache. You can improve performance on your site or application by enabling output caching. The cache is also integrated with the HTTP.sys kernel mode driver to help improve performance speed.
The cache is able to vary the output that is cached, based on query string values and HTTP headers that are sent from the client to the server. This helps to improve performance because the script used to generate dynamic output does not need to run for each request. Internet Information Services (IIS) 7.0 and above, has an output cache feature that caches dynamic content in memory (for example, output from your Microsoft® ASP.NET, classic Active Server Pages (ASP), PHP, or other dynamic pages). When you return to a page you've recently looked at, the browser can get those files from the cache rather than the original server, saving you time and saving the network the burden of additional traffic. For example, the files you automatically request by looking at a Web page are stored on your hard disk in a cache subdirectory under the directory for your browser. What is Caching?Ĭaching (pronounced "cashing") is the process of storing data in a cache.Ī cache is a temporary storage area. In the previous article, I mentioned how to generate CSR on IIS and install SSL on IIS, but in this article, I have mentioned how we can enable Caching on IIS, to speed up your website performance and reduce web-page load time, which will improve your SEO rankings.
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