A side- effect of #speculationrules is that CrUX shows a degradation in TTFB.
Reason?
CrUX unfortunately excludes TTFB from pre-rendered pages (subsequent navigations).
As a result, the CrUX dataset for TTFB contains a relatively larger amount of slower landing pages.
#webperf
Reason?
CrUX unfortunately excludes TTFB from pre-rendered pages (subsequent navigations).
As a result, the CrUX dataset for TTFB contains a relatively larger amount of slower landing pages.
#webperf
November 22, 2024 at 9:22 AM
A side- effect of #speculationrules is that CrUX shows a degradation in TTFB.
Reason?
CrUX unfortunately excludes TTFB from pre-rendered pages (subsequent navigations).
As a result, the CrUX dataset for TTFB contains a relatively larger amount of slower landing pages.
#webperf
Reason?
CrUX unfortunately excludes TTFB from pre-rendered pages (subsequent navigations).
As a result, the CrUX dataset for TTFB contains a relatively larger amount of slower landing pages.
#webperf
May 8, 2026 at 12:40 PM
the mark of a proud web developer
September 21, 2026 at 12:37 AM
the mark of a proud web developer
We often think perf metrics like TTFB & LCP track 1-1. @csswizardry.com notes that sometimes enabler metrics like TTFB will regress in order to improve LCP. Example: a site moves its HTML generation from client to server; TTFB tanks & LCP improves. Lesson: not all metric regressions are bad #perfnow
November 14, 2024 at 9:59 AM
We often think perf metrics like TTFB & LCP track 1-1. @csswizardry.com notes that sometimes enabler metrics like TTFB will regress in order to improve LCP. Example: a site moves its HTML generation from client to server; TTFB tanks & LCP improves. Lesson: not all metric regressions are bad #perfnow
We've optimized our Incremental Static Regeneration (ISR) infrastructure to be faster and more cost-efficient. This means up to:
• 65% savings on ISR reads and writes
• 40% improved TTFB for ISR cache misses
• 80% improved TTFB for ISR cache reads
vercel.com/blog/isr-on-...
• 65% savings on ISR reads and writes
• 40% improved TTFB for ISR cache misses
• 80% improved TTFB for ISR cache reads
vercel.com/blog/isr-on-...
ISR on Vercel is now faster and more cost-efficient - Vercel
We've optimized how ISR cache updates are managed on Vercel, making them faster and more cost-efficient.
vercel.com
January 30, 2025 at 10:56 PM
We've optimized our Incremental Static Regeneration (ISR) infrastructure to be faster and more cost-efficient. This means up to:
• 65% savings on ISR reads and writes
• 40% improved TTFB for ISR cache misses
• 80% improved TTFB for ISR cache reads
vercel.com/blog/isr-on-...
• 65% savings on ISR reads and writes
• 40% improved TTFB for ISR cache misses
• 80% improved TTFB for ISR cache reads
vercel.com/blog/isr-on-...
speaking of Hunchback and the modern puritans, you really cannot say enough how great "Hellfire" is. They went *hard* on this song and it resonates in the modern day all too well. Also Tony Jay just crushes it. www.youtube.com/watch?v=tTFb...
The Hunchback of Notre Dame (1996) │ Hellfire [UCG HD 4K]
YouTube video by l00p
www.youtube.com
May 19, 2026 at 4:46 PM
speaking of Hunchback and the modern puritans, you really cannot say enough how great "Hellfire" is. They went *hard* on this song and it resonates in the modern day all too well. Also Tony Jay just crushes it. www.youtube.com/watch?v=tTFb...
a few fun but unnecessary optimisations and lopcode.com ttfb is ~15-20ms for me in europe now
java can be fast 🚀
java can be fast 🚀
Home
Hejsan! I'm sage 👋. This is my personal website, to share my links, thoughts, and what I’m working on at the moment.
lopcode.com
September 27, 2026 at 2:56 PM
a few fun but unnecessary optimisations and lopcode.com ttfb is ~15-20ms for me in europe now
java can be fast 🚀
java can be fast 🚀
Web Performance Calendar day 24 with @programmingart.bsky.social on TTFB. Yes, it's one of those X-mas Eves where we cuddle by the fire, drop everything and immerse into re-learning and re-evaluating what we thought we knew about a concept we use daily
calendar.perfplanet.com/2025/ttfb-do...
calendar.perfplanet.com/2025/ttfb-do...
TTFB doesn't mean what you think it means
Time-To-First-Byte (TTFB) is a popular performance metric, yet there are many problems and nuances with it. Not only does it have several different definitions, it is usually also a "compound" metric,...
calendar.perfplanet.com
December 24, 2025 at 1:22 PM
Web Performance Calendar day 24 with @programmingart.bsky.social on TTFB. Yes, it's one of those X-mas Eves where we cuddle by the fire, drop everything and immerse into re-learning and re-evaluating what we thought we knew about a concept we use daily
calendar.perfplanet.com/2025/ttfb-do...
calendar.perfplanet.com/2025/ttfb-do...
'He's become SO CRINGE': MAGA podcasters exhausted and EMBARRASSED by Trump no longer covering him.
www.youtube.com/watch?v=ttfb...
www.youtube.com/watch?v=ttfb...
'He's become SO CRINGE': MAGA podcasters exhausted and EMBARRASSED by Trump no longer covering him
YouTube video by MS NOW
www.youtube.com
September 24, 2026 at 12:01 AM
'He's become SO CRINGE': MAGA podcasters exhausted and EMBARRASSED by Trump no longer covering him.
www.youtube.com/watch?v=ttfb...
www.youtube.com/watch?v=ttfb...
You WON'T guess where I'm from from this TTFB map (IMPOSSIBLE)
December 16, 2025 at 8:54 PM
You WON'T guess where I'm from from this TTFB map (IMPOSSIBLE)
You can optimise your frontend code and media as much as you like, but you can't offset a failing starting time with that.
As @csswizardry.com once said "While a good TTFB doesn’t necessarily mean you will have a fast website, a bad TTFB almost certainly guarantees a slow one."
6/17
As @csswizardry.com once said "While a good TTFB doesn’t necessarily mean you will have a fast website, a bad TTFB almost certainly guarantees a slow one."
6/17
January 9, 2025 at 4:55 PM
You can optimise your frontend code and media as much as you like, but you can't offset a failing starting time with that.
As @csswizardry.com once said "While a good TTFB doesn’t necessarily mean you will have a fast website, a bad TTFB almost certainly guarantees a slow one."
6/17
As @csswizardry.com once said "While a good TTFB doesn’t necessarily mean you will have a fast website, a bad TTFB almost certainly guarantees a slow one."
6/17
I recently started instrumenting both @cloudflare.social and browser cache hits/misses and the numbers, while obvious, are compelling. The best request is the one that never happens. Check that 0ms TTFB 😍
℅ @speedcurve.com
℅ @speedcurve.com
September 20, 2025 at 1:07 PM
I recently started instrumenting both @cloudflare.social and browser cache hits/misses and the numbers, while obvious, are compelling. The best request is the one that never happens. Check that 0ms TTFB 😍
℅ @speedcurve.com
℅ @speedcurve.com
TTFB has been around FOREVER as a #webperf metric, you'd think it would be well defined and well understood. @programmingart.bsky.social proves otherwise.
I loved reviewing this one: calendar.perfplanet.com/2025/ttfb-do...
I loved reviewing this one: calendar.perfplanet.com/2025/ttfb-do...
TTFB doesn't mean what you think it means
Time-To-First-Byte (TTFB) is a popular performance metric, yet there are many problems and nuances with it. Not only does it have several different definitions, it is usually also a "compound" metric,...
calendar.perfplanet.com
December 24, 2025 at 6:39 PM
TTFB has been around FOREVER as a #webperf metric, you'd think it would be well defined and well understood. @programmingart.bsky.social proves otherwise.
I loved reviewing this one: calendar.perfplanet.com/2025/ttfb-do...
I loved reviewing this one: calendar.perfplanet.com/2025/ttfb-do...
Nuxt 4.5 is out, and it's a big one. 🚀
- ⚡️ Vite 8
- 🦀 Rspack 2, now powered by Rsbuild
- 🌊 experimental SSR streaming for faster TTFB
- 🩺 a new stable error code system
- 🎨 useLayout, named views, and more
... plus a lot of groundwork for Nuxt 5!
💚💚💚
- ⚡️ Vite 8
- 🦀 Rspack 2, now powered by Rsbuild
- 🌊 experimental SSR streaming for faster TTFB
- 🩺 a new stable error code system
- 🎨 useLayout, named views, and more
... plus a lot of groundwork for Nuxt 5!
💚💚💚
Nuxt 4.5 · Nuxt Blog
Nuxt 4.5 is our biggest release in a while. Vite 8, Rspack 2 powered by Rsbuild, experimental SSR streaming, a stable error code system, a new useLayout composable, named views, and a lot of groundwor...
nuxt.com
July 18, 2026 at 7:37 PM
Nuxt 4.5 is out, and it's a big one. 🚀
- ⚡️ Vite 8
- 🦀 Rspack 2, now powered by Rsbuild
- 🌊 experimental SSR streaming for faster TTFB
- 🩺 a new stable error code system
- 🎨 useLayout, named views, and more
... plus a lot of groundwork for Nuxt 5!
💚💚💚
- ⚡️ Vite 8
- 🦀 Rspack 2, now powered by Rsbuild
- 🌊 experimental SSR streaming for faster TTFB
- 🩺 a new stable error code system
- 🎨 useLayout, named views, and more
... plus a lot of groundwork for Nuxt 5!
💚💚💚
This looks pretty cool - checking TTFB from 40 locations around the world. My California-based shared host is looking a little embarrassing
speedvitals.com/ttfb-test?ur...
speedvitals.com/ttfb-test?ur...
December 26, 2024 at 6:49 PM
This looks pretty cool - checking TTFB from 40 locations around the world. My California-based shared host is looking a little embarrassing
speedvitals.com/ttfb-test?ur...
speedvitals.com/ttfb-test?ur...
@csswizardry.com is has some very wise words about TTFB #perfnow
October 30, 2025 at 9:22 AM
@csswizardry.com is has some very wise words about TTFB #perfnow
We love that our friends at Adevinta (hi @nucliweb.net!) use #webperf budgets to track TTFB and get alerts on redirect times! How you can do the same:
Diagnose TTFB: www.speedcurve.com/web-performa...
Guide to performance budgets: www.speedcurve.com/web-performa...
#ux #sitespeed #pagespeed
Diagnose TTFB: www.speedcurve.com/web-performa...
Guide to performance budgets: www.speedcurve.com/web-performa...
#ux #sitespeed #pagespeed
March 6, 2025 at 7:18 PM
We love that our friends at Adevinta (hi @nucliweb.net!) use #webperf budgets to track TTFB and get alerts on redirect times! How you can do the same:
Diagnose TTFB: www.speedcurve.com/web-performa...
Guide to performance budgets: www.speedcurve.com/web-performa...
#ux #sitespeed #pagespeed
Diagnose TTFB: www.speedcurve.com/web-performa...
Guide to performance budgets: www.speedcurve.com/web-performa...
#ux #sitespeed #pagespeed
There are a number of announcements this month:
First up, we have added LCP image subparts to the CrUX API:
- Time to First Byte (TTFB)
- Resource load delay
- Resource load duration
- Element render delay
These are our recommended way of optimizing LCP: web.dev/articles/opt...
4/10
First up, we have added LCP image subparts to the CrUX API:
- Time to First Byte (TTFB)
- Resource load delay
- Resource load duration
- Element render delay
These are our recommended way of optimizing LCP: web.dev/articles/opt...
4/10
February 11, 2025 at 8:06 PM
There are a number of announcements this month:
First up, we have added LCP image subparts to the CrUX API:
- Time to First Byte (TTFB)
- Resource load delay
- Resource load duration
- Element render delay
These are our recommended way of optimizing LCP: web.dev/articles/opt...
4/10
First up, we have added LCP image subparts to the CrUX API:
- Time to First Byte (TTFB)
- Resource load delay
- Resource load duration
- Element render delay
These are our recommended way of optimizing LCP: web.dev/articles/opt...
4/10
Ohhh happy to see the CrUX field LCP subparts data coming to Chrome DevTools.
Stop wasting time optimizing your front end code, if your issue is TTFB!
Stop wasting time optimizing your front end code, if your issue is TTFB!
February 28, 2025 at 2:47 PM
Ohhh happy to see the CrUX field LCP subparts data coming to Chrome DevTools.
Stop wasting time optimizing your front end code, if your issue is TTFB!
Stop wasting time optimizing your front end code, if your issue is TTFB!
😍 A WebPerformance Journey done right! 🚀
Optimized TTFB = Faster Core Web Vitals ⚡️
Start your improvement now!
👉 webperformancereport.com
#WebPerf #CoreWebVitals #CrUX #TTFB
Optimized TTFB = Faster Core Web Vitals ⚡️
Start your improvement now!
👉 webperformancereport.com
#WebPerf #CoreWebVitals #CrUX #TTFB
January 28, 2025 at 5:01 PM
😍 A WebPerformance Journey done right! 🚀
Optimized TTFB = Faster Core Web Vitals ⚡️
Start your improvement now!
👉 webperformancereport.com
#WebPerf #CoreWebVitals #CrUX #TTFB
Optimized TTFB = Faster Core Web Vitals ⚡️
Start your improvement now!
👉 webperformancereport.com
#WebPerf #CoreWebVitals #CrUX #TTFB
Do you have a website with international visitors?
Check the Time to First Byte (TTFB) from different locations, and create a plan to improve it if your visitors are having a bad experience.
Start testing today, links in the first comment.
#WebPerf #PerfTools #Performance #TTFB
Check the Time to First Byte (TTFB) from different locations, and create a plan to improve it if your visitors are having a bad experience.
Start testing today, links in the first comment.
#WebPerf #PerfTools #Performance #TTFB
August 21, 2025 at 10:05 AM
Do you have a website with international visitors?
Check the Time to First Byte (TTFB) from different locations, and create a plan to improve it if your visitors are having a bad experience.
Start testing today, links in the first comment.
#WebPerf #PerfTools #Performance #TTFB
Check the Time to First Byte (TTFB) from different locations, and create a plan to improve it if your visitors are having a bad experience.
Start testing today, links in the first comment.
#WebPerf #PerfTools #Performance #TTFB
What is Time to First Byte and what can you do about it? csswizardry.com/2019/08/time...
Time to First Byte: What It Is and How to Improve It – CSS Wizardry
Just how much does TTFB matter when it comes to front-end performance?
csswizardry.com
September 17, 2026 at 2:21 PM
What is Time to First Byte and what can you do about it? csswizardry.com/2019/08/time...