What methods would you apply for decreasing the loading time of a website?

Optimize images using tinypng or similar.

Use a caching plugin.

Remove all plugins that you don't need.

Install WPRocket.

Use a CDN if your traffic comes from multiple countries.
 
This thread contains the information you need for decreasing the load time on your site and there are many such threads you just need to use the search box and type your keyword

https://www.blackhatworld.com/seo/wordpress-optimization-guide-from-3-to-1-second-load-time.1230324/
 
If you using WP Elementor you can activate (don't forget to test first):
* Optimized DOM Output
* Improved Asset Loading
* Improved CSS Loading
---
Use different image sizes for desktop and mobile.
Host on VPS and use Cloudflare
Load Google font locally
 
Here are some of the many ways to increase your page speed:
Enable compression.
Minify CSS, JavaScript, and HTML.
Reduce redirects.
Remove render-blocking JavaScript.
Leverage browser caching.
Improve server response time.
Use a content distribution network.
Optimize images.
See : https://moz.com/learn/seo/page-speed
It shows you more about above steps with more detailed .

See : https://postclick.com/blog/landing-page-speed/
Check with these , it shows you 11 Common Causes of Slow Landing Page Load Speeds and shows you how to fix with more detailed steps .

See : https://help.instapage.com/hc/en-us/articles/360012067612-Why-is-my-page-slow-
It shows you some reasons about page slow .

Hope this Helps !
 
Use a fast loading theme and don't use too many or bloated plugins.
 
Thank you for your advises, I will consider
 
1. Image optimization
Crop, resize, compress, convert to webp with fallback to original (jpeg, png...)
The decision when to use png, jpeg, svg, or any other.
Lazy load all images, exclude images above the fold from lazy loading.

2. Video optimization
Avoid auto-play video above the fold. Compress video for the web. Put image overlay.

3. Hosting
Choose good hosting.

4. CDN
Use it if your site is international.

5. Compression
Brotli, gzip, or whatever compression your hosting or CDN provides for you.

6. Minify, Combine (or not :))
Minify your website’s CSS, HTML, and JavaScript files (you can do this with almost every cache plugin)
Test combine CSS files and JS files.
Combining can sometimes give good results and sometimes worse. It depends on the protocol (h1, h2, h3), how big the site is, and so on. Although it is recommended not to combine on h2, h3, sometimes the results are better when combined. Sometimes you'll need to exclude certain files.

7. Caching
If you are on WP, you can try with: WP Rocket (paid), LiteSpeed Cache Plugin (if you are on litespeed server), W3 Total Cache (don't use it with Elementor).

8. Database optimization

9. Reduce the number of used plugins. Use lightweight theme.

10. Optimize Third-party scripts (External scripts)

Probably one of the most common problems.
Most used:
Google Fonts, Google Maps, Google Tag Manager, Analytics, reCAPTCHA, FB pixels, YT embeds and others, Font Awesome, Eicons, ads...
You can optimize all of them.
Example:
*Fonts:
Test: swap, localhost, preconnect (if they are external), or preload for local hosted (for LCP or above the fold). Something can give you better something worst result.
*Font Awesome
Use inline SVG instead of Font Awesome.

You should test everything on staging (same server if possible). There is a lot of work, and much more things you can do. This is some basic guideline I made for you.

Important:
Google predominantly uses the mobile version of the content for indexing and ranking. Don't pay too much attention to desktop version (speed). If you optimize mobile speed, a desktop will be good too. But, your priority is mobile.

Website speed test:
It's a topic that can be said a lot. And I will explain once in detail, now only briefly: test speed for the mobile version only, for the testing location - use the country from which most visitors come from. There are many testing tools and when I have time I will explain in more detail.
 
1. Image optimization
Crop, resize, compress, convert to webp with fallback to original (jpeg, png...)
The decision when to use png, jpeg, svg, or any other.
Lazy load all images, exclude images above the fold from lazy loading.

2. Video optimization
Avoid auto-play video above the fold. Compress video for the web. Put image overlay.

3. Hosting
Choose good hosting.

4. CDN
Use it if your site is international.

5. Compression
Brotli, gzip, or whatever compression your hosting or CDN provides for you.

6. Minify, Combine (or not :))
Minify your website’s CSS, HTML, and JavaScript files (you can do this with almost every cache plugin)
Test combine CSS files and JS files.
Combining can sometimes give good results and sometimes worse. It depends on the protocol (h1, h2, h3), how big the site is, and so on. Although it is recommended not to combine on h2, h3, sometimes the results are better when combined. Sometimes you'll need to exclude certain files.

7. Caching
If you are on WP, you can try with: WP Rocket (paid), LiteSpeed Cache Plugin (if you are on litespeed server), W3 Total Cache (don't use it with Elementor).

8. Database optimization

9. Reduce the number of used plugins. Use lightweight theme.

10. Optimize Third-party scripts (External scripts)

Probably one of the most common problems.
Most used:
Google Fonts, Google Maps, Google Tag Manager, Analytics, reCAPTCHA, FB pixels, YT embeds and others, Font Awesome, Eicons, ads...
You can optimize all of them.
Example:
*Fonts:
Test: swap, localhost, preconnect (if they are external), or preload for local hosted (for LCP or above the fold). Something can give you better something worst result.
*Font Awesome
Use inline SVG instead of Font Awesome.

You should test everything on staging (same server if possible). There is a lot of work, and much more things you can do. This is some basic guideline I made for you.

Important:
Google predominantly uses the mobile version of the content for indexing and ranking. Don't pay too much attention to desktop version (speed). If you optimize mobile speed, a desktop will be good too. But, your priority is mobile.

Website speed test:
It's a topic that can be said a lot. And I will explain once in detail, now only briefly: test speed for the mobile version only, for the testing location - use the country from which most visitors come from. There are many testing tools and when I have time I will explain in more detail.
All right, I will wait for further, more detailed information. It's really helpful. Thanks
 
Compress and optimize your images.
Enable browser caching
Caching is one of the most effective ways to speed up your web pages.
Eliminate unnecessary plugins.
 
Choose a good hosting it will surely make a difference in your website speed. I used Cloudflare it was really good.
 
Instead of wrestling with complex plugin setups HOST on a speed up service - vps preferably.
 
As others have already said, lightweight theme, cache plugin like WP Rocket and a good web host like WPX :)
 
Give lazy load a try. Does not actually make your website run faster but it gives that idea.
 
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