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Very high LCP and TTFB – homepage performance issue (mobile + desktop)


DariuszBladana

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I run an online store based on PrestaShop 8.1.4 – letsgotry.pl.
The store works and customers are using it, but everything is extremely slow, and the loading times can honestly drive you crazy.

Tests performed in Google PageSpeed Insights / Core Web Vitals indicate serious performance issues, especially on mobile devices, which results in failing Core Web Vitals.

Access to the report:
https://pagespeed.web.dev/analysis/https-letsgotry-pl/rzfih6p97u?form_factor=mobile

1. Core Web Vitals – CrUX, Mobile

LCP: 8.9 s
INP: 198 ms
CLS: 0
FCP: 8.8 s
TTFB: 6.2 s

Core Web Vitals – Desktop:

LCP: 10.9 s
INP: 59 ms
CLS: 0
FCP: 7.5 s
TTFB: 6.1 s

Lighthouse – Mobile:

FCP: 3.9 s
LCP: 16.4 s
Speed Index: 14.6 s
TBT: 110 ms

Lighthouse – Desktop:

FCP: 1.0 s
LCP: 7.6 s
Speed Index: 9.7 s
TBT: 180 ms
CLS: 0

When I enable debug mode, I get a huge number of errors. I won’t hide that I’ve already tried fixing them three times using ChatGPT. Each time, about 3/4 of the instructions work fine, but the final steps that involve code changes usually end with HTTP 500 errors or even blocking access to the back office, which I then have to undo and roll back to the starting point.

I’m not asking for miracles, but for real, feasible tools and solutions that will allow me to fix the store’s performance so that it loads in a reasonable, modern way — as expected in 2025.

All images in the store have already been converted to WebP.
Lazy loading is enabled, as far as I know, and is working.

If you need anything from the back office side, please let me know — I’m happy to share the required information.

Thank you in advance.

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Hi,
This will not change your TTFB, but you should first correct HTML code errors such as:

									<div class="html_inside ">
													<!DOCTYPE html>
<html>
<head>
</head>
<body>
<p>Telefon: +48 535 528 028    E-mail: <a href="mailto:[email protected]">[email protected]</a>    Godziny pracy: 10:00-18:00</p>
</body>
</html>
											</div>

Or all the </br> used when it should be <br> or <br />

For your TTFB, you can also test by removing the concatenation of JS and CSS files in the Performance page.

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