Hey Again,

Thanks for reaching out! .

I had a quick look at the page you referenced: https://pagespeed.web.dev/analysis/https-bewustbouwadvies-nl-bouwtekening-dakkapel-en-vergunning/28a1ebj6og?form_factor=mobile 

The LCP issues is caused by the Render Delay. 

Could you setup WP Rocket as mentioned in our guide so we can test this further ?. 

Try using the Optimization plugins recommended in this Article http://themenectar.com/docs/salient/performance-optimization-guide/ and check if that makes a difference. 

The Main Things are as follows:

1. Use the Performance Lab plugin, specifically the Modern Image Formats inside of it. Once that's active, you'll need to regenerate your website images to create them in the modern formats.
2. Use a plugin to bring your Google fonts local: OMGF is a great free plugin to handle that: https://wordpress.org/plugins/host-webfonts-local/
3. Delay the third-party JS scripts if added [Google Tag Manager, Hotjar, Cookiebot]. We don't offer any functionality in Salient to help with that. You would either need to write a script to handle it or use a plugin like WPRocket to delay them.

Best,

1. Review WP Rocket settings against the Salient Performance Guide.
2. Always clear all cache (browser, plugin, server) after changes or using the "?nowprocket" query string. 
3. Test for plugin conflicts by deactivating others temporarily .
4. Ensure you’ve regenerated thumbnails after implementing image optimization tools to serve correctly sized images.

You can send them here by switching to the Private message box.

Thanks

Also please confirm, you have all the performance features enabled in the Salient Theme Options Panel :  

Thanks 

Hi again,

It looks like the login credentials aren't working. In the meantime, please try adding the custom CSS code I shared earlier and clear your cache to see if that resolves the issue.

Thanks!

Hey Again,

Thanks for the update! I gave it a quick check, and since both WP Rocket and SiteGround Optimizer are active, it’s difficult to accurately test or identify the issue—these tools often apply overlapping optimizations that can mask changes.

We recommend temporarily disabling all optimization plugins, and then turning them back on one at a time, starting with the most essential. This step-by-step approach will help pinpoint what might be affecting the site’s behavior.

Let us know how it goes!

Thanks 

Hey again,

Just to clarify—achieving a 100% mobile score is definitely possible with WP Rocket; we've seen other users accomplish this while using the Salient theme, so the theme itself isn't a limitation.

Keep in mind that changes made in WP Rocket aren’t always applied instantly. Their documentation explains this in more detail here:
WP Rocket – Asynchronous Optimizations

For the best results based on your specific server setup, I’d recommend reaching out to WP Rocket’s support team. In the meantime, I’ve already configured the Salient settings to their optimal values.

Best 

Hey Again,

Thanks for your patience with this. Escalating this to the developer for further response. 

Best,

Hey Again,

So the developer responded and the developer pointed out that the image used is quite large — around 2048px wide for desktop and approximately 869KB even on mobile. I have gone ahead and cropped the image to reduce its size. 

To optimize further, you could consider cropping the mobile version down more aggressively or replacing it with a small, plain color image (e.g., 10x10px) as a background.

I went through the full setup and was able to achieve a score of 80 on mobile via PageSpeed Insights:
View Report

Here’s a quick summary of what I adjusted to reach that score:

• Disabled parallax background on mobile

• Set the top-level image row background to "Skip lazy load"

• Disabled background layer animation on mobile

• OMGF wasn’t working on your server, so I installed “Local Google Fonts” instead

• Installed SiteGround Optimizer and disabled cache within plugin settings

• Installed WP Rocket and fine-tuned the settings accordingly

Thanks 

Glad to help. 

You need to use WProcket to clear the cache. 

Also to further improve it adding an even smaller sized image as mentioned earlier and reduce the dom size by removing some elements.

Best