On page Seo Issue

Please help senior

currently this is 3 of my problem 2 being red ( tested on PageSpeed Insights )

1. Properly size images Potential savings of 16 KiB
> i have optimized my images on my website with WP plugins [ imagify ] but still the image considered red.
I wanted to replace the image but the current image is already indexed , should i replaced or no guys ?

2. Reduce initial server response time Root document took 1,280 ms
> i already used CDN but still this happened, any suggestion ?

3. Reduce unused CSS Potential savings of 13 KiB
> Pagespeed insight recommend me to delete unused CSS with Coverage tab.
Unused CSS is considered red, there is so many red codes that are considered unused . Is it alright to delete all those red?

1. Properly Size Images
Issue: Potential savings of 16 KiB, images still flagged despite optimization.

Indexed Image Concern:If an image is already indexed by search engines, replacing it can impact your SEO rankings temporarily. However, if the new image is properly optimized and relevant, it can be beneficial in the long term.

Replace with Caution:If the current image’s quality and size are not significantly impacting performance, you might keep it. Otherwise, consider updating it with a properly optimized version.
Maintain SEO: Use the same alt text and file name for the new image to retain as much SEO value as possible.
Further Optimization:Ensure the new image is in a web-friendly format (like WebP) and appropriately compressed. Even after using plugins, manual checks can sometimes catch additional optimizations.

2. Reduce Initial Server Response Time
Issue: Root document took 1,280 ms despite using CDN.

Server Performance: Your server might be under heavy load or not optimized.
Backend Processing:Complex server-side processes or database queries might delay responses.
Network Latency:Check if there’s a high network latency between your server and users.

Check Server Load: Use server monitoring tools to assess if your server is experiencing high load or slow response times.
Optimize Backend: Review and optimize your server-side scripts and database queries.
CDN Configuration: Ensure your CDN is properly configured to cache content effectively. Sometimes, deeper CDN configurations or different CDN services might be required.
Use a Performance Hosting Provider:Consider upgrading to a hosting provider known for high performance.

3. Reduce Unused CSS
Issue: Potential savings of 13 KiB, Pagespeed Insights recommend deleting unused CSS.

Identifying Unused CSS:The Coverage tab in Chrome DevTools can show which CSS is used or unused on your site.

Action Steps:
Audit Carefully:Before deleting CSS, ensure it's genuinely unused across different pages and screen sizes. Some CSS might not be used on the current page but could be necessary for other parts of your site or for responsive design.
Remove with Cautioneleting CSS should be done carefully to avoid breaking the site's appearance. Consider removing small portions incrementally and testing thoroughly.
Use CSS Loaders:Tools like PurgeCSS can help automatically remove unused CSS from your stylesheets.
Optimize CSS Delivery: Use asynchronous loading for non-critical CSS and inline critical CSS for faster rendering

1. You Manual Compression tools like TinyPNG or ImageOptim

2. Use High Quality Hosting , Use Plugins that enable Cache

3.Use tools like PurifyCSS or PurgeCSS to remove unused CSS safely

These are some of my suggestions...

Take the top sites for your main kws and check their speed

9 out of 10 times they're all fcked up speedwise and google doesn't care because $$$

On-page SEO issues can negatively impact a website's performance and rankings. Some common on-page SEO issues include:
- Low-Quality Content
- Poor site structure and navigation
- Poor quality external links
- Missing or unoptimized title tags and meta descriptions, slow page speed