Whatever I do TTFB doesn't go down

[Ashutosh Khadka]

Hi Guys,
I am having a bit of problem here.
We changed from Porto to Hyva last year on November 2025.
And have tried everything to get the lab scores to 90+ but now the crux data I see has all messed up numbers. We have invested all our time and effort for 6 months on this but our TTBF is significantly high 1.8seconds which results to LCP and FCP being high.
As you can see in the screenshots, our lab data is perfect. Crux data is failing. I will be very thankful for anyone who ha suggestions and are willing to help.
https://pagespeed.web.dev/analysis/https-www-digitalcinema-com-au-denon-avc-x4800h-9-4-channel-8k-av-receiver-html/25rrrxaqt5?form_factor=desktop

https://cruxvis.withgoogle.com/#/?view=cwvsummary&url=https%3A%2F%2Fwww.digitalcinema.co[…]in&device=DESKTOP&periodStart=0&periodEnd=-1&display=p75s

Product page is
https://www.digitalcinema.com.au/denon-avc-x4800h-9-4-channel-8k-av-receiver.html

Things we have tried to minimalise TTFB:

1. Maintain server or application full page caching so product and category pages are served as prebuilt HTML.
2. Use CDN edge caching for static assets (CSS, JS, images) so global users receive files from the nearest server.
3. Optimise origin server response by ensuring database and PHP processes are not overloaded.
4. Ensure compression (Brotli or Gzip) is enabled for faster transfer of HTML and assets.
5. Reduce unnecessary backend requests triggered during page load (for example excessive dynamic section calls).
6. Maintain efficient object caching (Redis or equivalent) for Magento session and page elements.
7. PNG to WebP conversion of images.

I doubt we are still missing something. Can you help me debug this? We have tried everything that's on our reach.

Thanks

Ash

[Gilberto Cocchi]

Hi Ash, I am not an expert of Cloudflare CDN but it looks like you are not leveraging CDN Edge Cache hit on the HTML, that means that users are most likely always hitting the Origin Server that is quite slow (perhaps missing some caching layers on the Hyva side) and the CDN is hot helping making this better wihtout Caching the HTML at the edge.

See: https://developers.cloudflare.com/cache/how-to/cache-rules/

You also seems to be having some URLs with the query param "srsltid=" that is causing Origin Caching invalidation, that is definitively contributing to keep TTFB up.

In order to emulate these scenarios, try looking for "digitalcinema au" on Google Search, with DevTools Cache disabled and Network Fast 3G or 4G, it's really easy to get a TTFB from 1.5 to 4s on that site locally.

Hope this helps.

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[Robert Lozano]

Other things that can help with TTFB:

• CDN is a must, cache static assets, docs, images.
• Compression at origin AND and the edge/CDN.
• IPv6 at edge/CDN. This can cut 50ms - 300ms 
• HTTP/3 at edge/CDN. This can cut 15% of connection overheard
• Early Hints HTTP 103
• Persistent Connection improvements (Performance and TTLs)
• DNS improvements (performance and TTLs)

Robert Lozano

 

From: 'Gilberto Cocchi' via Chrome UX Report (Discussions) <chrome-u...@chromium.org>
Date: Monday, March 9, 2026 at 1:07 AM
To: Ashutosh Khadka <a...@avmail.com.au>
Cc: Chrome UX Report (Discussions) <chrome-u...@chromium.org>, Norman Ramos <nor...@avmail.com.au>, Paul Heilbronn <pa...@avmail.com.au>
Subject: Re: [CrUX Discuss] Whatever I do TTFB doesn't go down

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[Gilberto Cocchi]

Hi Ashutosh, well done.

Please remember I am not a Cloudflare expert but I do see now some HTML Document hits coming through, you may see some TTFB improvements as a result of that.

Having said that, I still believe it's worth increasing the Caching layer at the Hyva Server setup if possible, first time browsing URLs still hit Origin, making that navigation faster would help.

Did you check your RUM data to measure if TTFB is improving?

On Thu, Mar 12, 2026 at 5:52 AM Ashutosh Khadka <a...@avmail.com.au> wrote:

Hi @glib and @rlo,

Your suggestions were very helpful. Can you check if we are missing anything now?

We have fixed the srstid thing and cache rules and also early hints.

Thank you

Ash

[Ashutosh Khadka]

Hi @glib and @rlo,

Your suggestions were very helpful. Can you check if we are missing anything now?

We have fixed the srstid thing and cache rules and also early hints.

Thank you

Ash

On Tuesday, March 10, 2026 at 3:30:51 AM UTC+11 rlo...@costar.com wrote:

[Ryan Townsend]

Hi Ashutosh,

I've just taken over managing the RUM / Web Analytics service at Cloudflare. If you haven't already, you may want to enable this to gather data from your real visitors, you can do so by selecting your domain in the Cloudflare dashboard, selecting "Speed" in the left-hand menu, then "Real user monitoring" and it should provide you the options for enabling it. The "Observatory" section (also under "Speed") will also supply you with automated suggestions for optimisations.

Cheers,

Ryan

[Ashutosh Khadka]

This was a very good suggestion. I have enabled it. Is this Normal?