Tim Vereecke
@timvereecke.bsky.social
Loves speeding up websites. Web performance architect @Akamai, also runs https://www.scalemates.com #WebPerf #PageSpeed #SEO
The new SVG hack? (Context: The lack of preconnect/preload means there is 0.000 performance impact for the user)
Gaming the system? Lack of knowledge? Or is there a benefit not linked to #webperf?
Heard about this at @perfnow.nl
Gaming the system? Lack of knowledge? Or is there a benefit not linked to #webperf?
Heard about this at @perfnow.nl
November 7, 2025 at 11:47 AM
The new SVG hack? (Context: The lack of preconnect/preload means there is 0.000 performance impact for the user)
Gaming the system? Lack of knowledge? Or is there a benefit not linked to #webperf?
Heard about this at @perfnow.nl
Gaming the system? Lack of knowledge? Or is there a benefit not linked to #webperf?
Heard about this at @perfnow.nl
103 Early Hints is now supported by more than 92% of all users.
When done right, it is a great way to improve your higher percentiles of FCP and LCP
#webperf
When done right, it is a great way to improve your higher percentiles of FCP and LCP
#webperf
November 5, 2025 at 3:00 PM
103 Early Hints is now supported by more than 92% of all users.
When done right, it is a great way to improve your higher percentiles of FCP and LCP
#webperf
When done right, it is a great way to improve your higher percentiles of FCP and LCP
#webperf
Scalemates was used by @tunetheweb.com as an example of how fast a site can be using the Speculation Rules API.
It has an LCP of 483ms at the P75!
#webperf
It has an LCP of 483ms at the P75!
#webperf
October 31, 2025 at 9:37 PM
Scalemates was used by @tunetheweb.com as an example of how fast a site can be using the Speculation Rules API.
It has an LCP of 483ms at the P75!
#webperf
It has an LCP of 483ms at the P75!
#webperf
Why is my site fast?
55% of my pageviews on Desktop are coming from Bfbache or had an early start with Prerendering. 👌
#webperf is easy* in 2025
(*I know I know)
55% of my pageviews on Desktop are coming from Bfbache or had an early start with Prerendering. 👌
#webperf is easy* in 2025
(*I know I know)
January 15, 2025 at 2:00 PM
Why is my site fast?
55% of my pageviews on Desktop are coming from Bfbache or had an early start with Prerendering. 👌
#webperf is easy* in 2025
(*I know I know)
55% of my pageviews on Desktop are coming from Bfbache or had an early start with Prerendering. 👌
#webperf is easy* in 2025
(*I know I know)
Amazing (and simple) technique by @kilianvalkhof.com .
autofocus is a great way to make your login/registration and password reset forms more user-friendly
htmhell.dev/adventcalend...
I implemented it during my lunch break... so much better!
#UX #htmhell
autofocus is a great way to make your login/registration and password reset forms more user-friendly
htmhell.dev/adventcalend...
I implemented it during my lunch break... so much better!
#UX #htmhell
January 10, 2025 at 2:17 PM
Amazing (and simple) technique by @kilianvalkhof.com .
autofocus is a great way to make your login/registration and password reset forms more user-friendly
htmhell.dev/adventcalend...
I implemented it during my lunch break... so much better!
#UX #htmhell
autofocus is a great way to make your login/registration and password reset forms more user-friendly
htmhell.dev/adventcalend...
I implemented it during my lunch break... so much better!
#UX #htmhell
My goal is P99 but not there yet! The 0.6%p I miss are however a though nut to crack
November 25, 2024 at 1:14 PM
My goal is P99 but not there yet! The 0.6%p I miss are however a though nut to crack
November 25, 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
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
@tunetheweb.com showcasing the power of the Speculation Rules API at #perfnow
November 15, 2024 at 1:23 PM
@tunetheweb.com showcasing the power of the Speculation Rules API at #perfnow
November 13, 2024 at 1:26 PM
@cliffcrocker.bsky.social summarising the Measurements and Metrics working group at the
#webperf Unconference!
#webperf Unconference!
November 13, 2024 at 1:23 PM
@cliffcrocker.bsky.social summarising the Measurements and Metrics working group at the
#webperf Unconference!
#webperf Unconference!
@derschepp.bsky.social in action at the #webperf unconference
November 13, 2024 at 1:16 PM
@derschepp.bsky.social in action at the #webperf unconference
The potential performance gains of the new Speculation Rules API are heavily influenced by the eagerness level.
Here is RUM data showing you the extra performance potential the Moderate option has compared to the Conservative level.
#webperf #speculationrules
Here is RUM data showing you the extra performance potential the Moderate option has compared to the Conservative level.
#webperf #speculationrules
November 9, 2024 at 7:23 PM
The potential performance gains of the new Speculation Rules API are heavily influenced by the eagerness level.
Here is RUM data showing you the extra performance potential the Moderate option has compared to the Conservative level.
#webperf #speculationrules
Here is RUM data showing you the extra performance potential the Moderate option has compared to the Conservative level.
#webperf #speculationrules