birkscinema.co.uk

https://birkscinema.co.uk/

Data from Aug 20, 2026, 7:07 PM UTC — 22h old.

Built Awesome · 1 measurement · since Aug 20, 2026 · last attempt 22h

This URL redirects to https://birkscinema.co.uk/home.

Lighthouse follows the redirect, so the numbers below describe the destination page, not this one. Not yet confirmed as a move; it needs to lead to the same place on several consecutive runs first.

Stack

Detected on the same page load as the accessibility pass — the generator from <meta name="generator"> or the shape of the page, the host from response headers.

Hosted by Netlify

Core Web Vitals field data, url-level

Real Chrome users, 28-day window (2026-07-22 → 2026-08-18). This is what Google measures you on.

LCP 5.70 s poor

INP 946 ms poor

CLS 0.430 poor

Scores

Performance

no change

Accessibility

no change

Best Practices

no change

SEO

no change

Lab metrics Lighthouse, mobile

Metric	Current	Previous	Change	Best	Worst
LCP Largest Contentful Paint	38.30 s	—	—	38.30 s	38.30 s
CLS Cumulative Layout Shift	0.349	—	—	0.349	0.349
TBT Total Blocking Time	7.56 s	—	—	7.56 s	7.56 s
FCP First Contentful Paint	8.26 s	—	—	8.26 s	8.26 s
Speed Index	21.72 s	—	—	21.72 s	21.72 s
TTFB Time to First Byte	604 ms	—	—	604 ms	604 ms

What LCP is made of

A flat LCP number tells you something regressed. The subparts tell you whether it was the server, resource discovery, the download, or rendering.

resource load delay 5.48 s

element render delay 133 ms

resource load duration 7 ms

time to first byte 6 ms

Field data Chrome UX Report, url-level

Real Chrome users, 28-day trailing window (2026-07-22 → 2026-08-18). This is what Google measures you on.

Metric	p75	Rating	Distribution (good / needs work / poor)
LCP CWV	5.70 s	poor	56.7% good
INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run	946 ms	poor	33.6% good
CLS CWV	0.430	poor	39.6% good
FCP	1.58 s	good	78.7% good
TTFB	597 ms	good	82% good

Metric

p75

Rating

Distribution (good / needs work / poor)

LCP CWV

5.70 s

poor

56.7% good

INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run

946 ms

poor

33.6% good

CLS CWV

0.430

poor

39.6% good

FCP

1.58 s

good

78.7% good

TTFB

597 ms

good

82% good

Lab vs field

Lab LCP 38.30 s · field p75 5.70 s · real users are 0.15× faster than the lab.

Field history 25 weeks

Weekly p75 from the CrUX History API, backfilled in a single request.

Week ending	LCP	INP	CLS	FCP	TTFB
2026-08-15	5.27 s	939 ms	0.420	1.55 s	608 ms
2026-08-08	3.95 s	781 ms	0.400	1.43 s	630 ms
2026-08-01	2.28 s	445 ms	0.290	1.30 s	678 ms
2026-07-25	1.42 s	119 ms	0	1.17 s	713 ms
2026-07-18	1.18 s	71 ms	0	1.13 s	760 ms
2026-07-11	1.13 s	71 ms	0	1.07 s	737 ms
2026-07-04	1.14 s	72 ms	0	1.08 s	776 ms
2026-06-27	1.09 s	70 ms	0	1.05 s	771 ms
2026-06-20	1.13 s	70 ms	0	1.06 s	756 ms
2026-06-13	1.16 s	71 ms	0	1.09 s	746 ms
2026-06-06	1.15 s	70 ms	0	1.07 s	700 ms
2026-05-30	1.16 s	70 ms	0	1.11 s	700 ms

Week ending

LCP

INP

CLS

FCP

TTFB

2026-08-15

5.27 s

939 ms

0.420

1.55 s

608 ms

2026-08-08

3.95 s

781 ms

0.400

1.43 s

630 ms

2026-08-01

2.28 s

445 ms

0.290

1.30 s

678 ms

2026-07-25

1.42 s

119 ms

1.17 s

713 ms

2026-07-18

1.18 s

71 ms

1.13 s

760 ms

2026-07-11

1.13 s

71 ms

1.07 s

737 ms

2026-07-04

1.14 s

72 ms

1.08 s

776 ms

2026-06-27

1.09 s

70 ms

1.05 s

771 ms

2026-06-20

1.13 s

70 ms

1.06 s

756 ms

2026-06-13

1.16 s

71 ms

1.09 s

746 ms

2026-06-06

1.15 s

70 ms

1.07 s

700 ms

2026-05-30

1.16 s

70 ms

1.11 s

700 ms

Page weight

Metric	Current	Previous	Change	Best	Worst
Page Weight	10.69 MB	—	—	10.69 MB	10.69 MB
Requests	125	—	—	125	125
Third-party Weight	6.43 MB	—	—	6.43 MB	6.43 MB
Third-party CPU	169 ms	—	—	169 ms	169 ms
Unused JS	2.50 MB	—	—	2.50 MB	2.50 MB
Unused CSS	190.7 kB	—	—	190.7 kB	190.7 kB

By resource type

image 6.10 MB · 24 req

script 3.43 MB · 47 req

font 758.3 kB · 5 req

other 259.3 kB · 28 req

stylesheet 137.1 kB · 19 req

document 2.5 kB · 1 req

third party 6.43 MB · 42 req

Third parties 8 entities

6.43 MB transferred, 169 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

imgix 6.11 MB · 0 ms CPU

Accessibe Accessibility Overlay 234.9 kB · 89 ms CPU

Google Fonts 27.2 kB · 0 ms CPU

Cookie-Script.com 26.3 kB · 72 ms CPU

Rollbar 25.4 kB · 7 ms CPU

Page health

Metric	Current	Previous	Change	Best	Worst
Main Thread Work	23.18 s	—	—	23.18 s	23.18 s
Long Tasks	20	—	—	20	20
DOM Elements	1,486	—	—	1,486	1,486
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset	4	—	—	4	4
A11y Failures	4	—	—	4	4
A11y Failing Nodes	12	—	—	12	12

Main thread work

script evaluation 17.66 s

other 2.07 s

script parse compile 1.24 s

style layout 825 ms

garbage collection 797 ms

paint composite render 507 ms

parse HTML 72 ms

Axe violations axe-core 4.13.0, full rule set

4 violating nodes across 3 rules, 3559 passing. This is a standalone axe run, stricter than the subset Lighthouse folds into its score above — and it is the second tiebreaker in the ranking.

serious color-contrast — Elements must meet minimum color contrast ratio thresholds 2 nodes
moderate heading-order — Heading levels should only increase by one 1 node
moderate meta-viewport — Zooming and scaling must not be disabled 1 node

Accessibility failures 4 of 36 audits

Tracked as a count, not just the score — the weighted score is coarse enough that you can ship a broken component and barely move it.

label-content-name-mismatch — Elements with visible text labels do not have matching accessible names. 7 nodes
color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 3 nodes
heading-order — Heading elements are not in a sequentially-descending order 1 node
meta-viewport — `[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5. 1 node

Hygiene

Changes rarely — which is exactly why a change is worth noticing.

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2 1 console error

Measurement log

Every stored run for this URL, newest first. Failures are kept as records — "this site was down on Tuesday" is data too.

When	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took
Aug 20, 2026, 7:07 PM UTC	8	38.30 s	0.349	7.56 s	10.69 MB	3/3	±6	2,487	94.4s

When

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Aug 20, 2026, 7:07 PM UTC

38.30 s

0.349

7.56 s

10.69 MB

3/3

±6

2,487

94.4s

Embed this score

Live below, then the markup that produces it. Drop that on any page to show birkscinema.co.uk's scores, updated whenever this instance re-measures — more about the component. Don’t forget to bundle the speedlify-score.js component code into your site!

<speedlify-score speedlify-url="https://zachleat.github.io/speedlify2/" url="https://birkscinema.co.uk/"></speedlify-score>