Page speed is a big ranking factor for Google. Google has indicated that the site speed is one of the signals it uses to rank web sites. Here's what you can do to improve it:
Use CSS and JS to load scripts in the background while users are still loading your page's assets, thereby eliminating their need for a full page load before they see them on screen. You can also make sure people never see your site's markup without its assets by using a prefetch resource hint (the link rel="prefetch" attribute), which lets you load CSS and JS files in the background while users are still loading your page's assets, thereby eliminating their need for a full page load before they see them on screen.
Respond quickly to user inputs like typing in text boxes, clicking links, etc., so they're not waiting for a response that may never come because it depends on server response time or having to wait for content delivery over a slow connection with high latency (ping time). You can also reduce how quickly Google's browser will display nothing but a white screen by using server-side rendering whenever possible so users aren't waiting for the initial render of your site's markup before they begin interacting with it.
Avoid landing page redirects (301 or 302), especially three-hops or more, as they can often increase load times due to DNS lookups, TCP connection establishment and overhead, SSL negotiation of session keys, etc.
A 301 redirect is for when you want to move a URL deeper into the site. However, many sites should never put their content behind a 301 redirect, unless it's for user privacy reasons. And you should never have more than one 301 redirect for a website per domain. That may sound like a lot, but the reality is that each page on your site will typically have only one URL to load. Your pages shouldn't be broken up into separate URLs because it can lead to performance issues and unnecessary load time delays.
A 302 redirect is also used for when you're moving content out of your site, but the server will continue to show it with the same URL indefinitely. You should use a 302 redirect when you're moving content over to a different server, permanently. It's preferable to use the HTTP header "Location" as it's more user-friendly than the meta "Refresh" tag.
Implementing server side rendering whenever possible means that your pages will show up faster by not having to wait for a full HTML response. And it means all the information of your page is loaded in parallel and parsed before the HTML response is rendered (so it's ready to be displayed instantly).
The PrivateAnalytix lightweight tracking pixel is less than 3KB in size, which is 8x smaller than the Google Analytics tracking pixel. This will ensure that you pass less data to with every load, improving your site load speed.
You should use PNG or GIF image formats instead of JPEGs whenever possible, as they have smaller file sizes and the GND pixel format is supported, which means there is no perceptible delay when looking at a transparent PNG image on a slow connection (where PNGs have lower overhead than JPEGs).
CSS is really sensitive to changes in performance. This is because CSS can be parsed differently by each browser, and it can also be optimized in various ways (by the browser or a tool such as YSlow or PageSpeed). This means that just because one CSS change might make a big difference for one site doesn't necessarily mean it will do the same for another site. So you have to test your optimizations on your own site first before thinking that they'll work everywhere else as well.
Images are the single biggest issue with performance. Images that are heavily used can take a while to load, and if they're not optimized for performance, then they will end up being the slowest part of your page and cause a lot of problems.
Using images that are smaller in file size is better for performance because it requires less data to be transferred from the server to the browser over a slow connection and that means faster page rendering (less time-to-first-byte). I recommend compressing your existing images with TinyPNG or using PNG or GIF images instead of JPEGs, as they have smaller file sizes and they also don't introduce perceptible delay when looking at a transparent PNG image on a slow connection (where PNGs have lower overhead than JPEGs).
CSS animations cause issues because the browser has to re-layout the DOM when it's done coordinating all of the CSS properties. This is where we see a perceived latency, and it also slows down page rendering times (by causing them to be longer).
For example, if you have a 10-pixel wide content box that animates to 25 pixels wide, at 50 milliseconds per animation iteration, then in total that will result in 50 milliseconds extra time to render your page.
Converting an image to the placeholder and then scrolling it vertically a couple of times is a huge performance problem as it will not only slow down the page, but also cause the browser to have to re-layout the DOM whenever users move the cursor over the image and when they scroll.
Instead, just load your images in a container, which is what you do with all other image files anyway (so why not just load them as containers directly), and then have your application change one of its properties (e.g. scaleY , opacity or transform ) whenever it needs to then animate that property from 0% to 100%.
Similar to CSS animations, the browser has to re-layout the DOM whenever you use a CSS transform. This means that if you have an element that gets transformed (e.g. moved, rotated or scaled) 90 degrees for each animation iteration, then in total that will result in 90 milliseconds extra time to render your page.
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