SEO on page site speed

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The classic problems that generally slow down websites, reported for example by Gt Metrix reports, are the following:

Enable gzip compression
Need scaled images
Optimize images
Defer parsing of JavaScript
Minify JavaScript & CSS
Remove query strings from static resources
Some of these are easily solved with a few lines of code to be inserted inside for example the .htaccess file, others are easily manageable because they concern the images and their size and weight. Others still require the intervention of a programmer.

Mobile-first index
Between March and July 2018 Google announced list of philippines consumer email the roll-out of the Mobile First Index. From that moment on, Google first takes into consideration the mobile version of the site and then the desktop version and from there establishes its ranking on Google. As stated by Google, the priority indexing is on mobile content .

It almost goes without saying but your site must be responsive and well optimized for mobile too.

Update : In March 2021, the Google Mobile Only update will come into playwhere the desktop version of a site will not be considered in indexing.

Core Web Vitals
Pay attention to Core Web Vitals . Web Vitals are new factors that Google will introduce in May 2020. These new parameters evaluate and measure the user experience within the website.

Specifically they are: