PageSpeed Insight Tests evaluate things that can slow down a website’s speed and make sure that everything is running as quickly as possible. However, on a large website, there are lots of other factors at work that can have an impact on the results of these tests and are important to consider. It all depends on the design and use of the website and sometimes this isn’t easy to fix.
Other tests, focussing on reducing latency, suggest you leverage browser caching. This is a good idea because lots of files can benefit from being saved this way, however, you’d have to host them yourself. You’re also told to reduce server response time and avoid landing page redirects, which makes more sense. The less time wasted, the quicker a page will load. Prioritising visible content is also significant as it will keep a user on your page whilst everything else loads.
Therefore, it’s important to consider everything but also how small an impact everything has. It’s only when lots of factors are added together that a significant change can be made. As a result, it’s most productive to think about the things you can control, like caching content, reducing the amount you’re loading from third-party domains and using CDNs so you can pass the minimum requirements for PageSpeed Insight Tests.
To start improving your site, use Chome DevTools to figure out exactly what is causing your web pages to slow down when they load. Open the page in chrome and see what requests seem to take the longest as this will help you to narrow down the root of the problem. This is likely to be the bigger files with multimedia such as advertising.
Then, once you know what is influencing the speed, set a goal. It doesn’t have to be to achieve a perfect PageSpeed Insight score. You just need to be better than it currently is. Try reducing the bandwidth to meet your goal and then move onto latency checks and maybe try a CDN. Ask yourself what really needs to be loaded and go from there. Prioritising is key in meeting your target and remember, do not spend too much energy and focus on the scores, they don’t mean that much in the real world, speed is what actually counts.