birkscinema.co.uk

https://birkscinema.co.uk/

Ranks Overall #1,524 Built Awesome #1,125

Data from Sep 11, 2026, 8:44 AM UTC 3d old Measured once a week · 4 runs since Aug 20, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Scoring Calculator · Wayback Machine

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

The site’s front door pointing at the page it serves there — a locale or CMS landing path, not a move. The origin is still the address of the site, so history stays under it rather than forking to a path that depends on where the measurement ran. Lighthouse follows the redirect, so the numbers below describe the page actually served; the only cost is an extra hop on each run.

Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).

Stack

Hosted by Netlify

Lighthouse Scores LAB Simulated

Performance

↓ -2 (-28.6%)

Accessibility

no change

Best Practices

no change

SEO

no change

Metrics LAB FIELD

Core Web Vitals: failing 3 of 3 assessed from real Chrome users.

Field figures are the p75 across real Chrome users over a 28-day trailing window (2026-08-13 → 2026-09-09), url-level.

Metric	Lab Simulated	Field
LCP CWV Largest Contentful Paint	38.54 s poor	↓ -3052 ms (-7.3%) 38.04 s – 41.59 s	6.31 s poor	55.3% 6.7% 38.1%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	842 ms poor	33.9% 27.6% 38.5%
CLS CWV Cumulative Layout Shift	0.476 poor	↑ +0.111 (+30.4%) 0.349 – 0.477	0.440 poor	39.8% 11.2% 49.1%
TBT Total Blocking Time	8.10 s poor	↑ +1029 ms (+14.6%) significant 7.07 s – 8.10 s	n/a	—
FCP First Contentful Paint	8.10 s poor	↓ -192 ms (-2.3%) 8.10 s – 8.29 s	1.44 s good	80.5% 8.3% 11.2%
Speed Index	20.07 s poor	↓ -568 ms (-2.8%) 20.07 s – 21.72 s	n/a	—
TTFB Time to First Byte	618 ms good	↓ -14 ms (-2.2%) 604 ms – 655 ms	555 ms good	83.8% 8.8% 7.4%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

38.54 s poor

↓ -3052 ms (-7.3%) 38.04 s – 41.59 s

6.31 s poor

55.3% 6.7% 38.1%

INP CWV Interaction to Next Paint — field only, no lab run can measure it

n/a

—

842 ms poor

33.9% 27.6% 38.5%

CLS CWV Cumulative Layout Shift

0.476 poor

↑ +0.111 (+30.4%) 0.349 – 0.477

0.440 poor

39.8% 11.2% 49.1%

TBT Total Blocking Time

8.10 s poor

↑ +1029 ms (+14.6%) significant 7.07 s – 8.10 s

n/a

—

FCP First Contentful Paint

8.10 s poor

↓ -192 ms (-2.3%) 8.10 s – 8.29 s

1.44 s good

80.5% 8.3% 11.2%

Speed Index

20.07 s poor

↓ -568 ms (-2.8%) 20.07 s – 21.72 s

n/a

—

TTFB Time to First Byte

618 ms good

↓ -14 ms (-2.2%) 604 ms – 655 ms

555 ms good

83.8% 8.8% 7.4%

LCP Subparts LAB Unthrottled

The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab LCP shown above is a simulated throttled estimate.

resource load delay 5.51 s

element render delay 278 ms

time to first byte 107 ms

resource load duration 18 ms

LCP LAB Simulated vs LCP FIELD

Lab 38.54 s

Field p75 6.31 s

The lab LCP is 6.11× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	9.72 MB	↓ -551.9 kB (-5.5%) 9.05 MB – 10.69 MB
Requests	133	↑ +1 (+0.8%) 125 – 133
Third-party Weight	5.43 MB	↓ -563.8 kB (-9.6%) 4.80 MB – 6.43 MB
Third-party CPU	132 ms	↓ -51 ms (-27.8%) significant 132 ms – 195 ms
Unused JS	2.51 MB	↑ +5.7 kB (+0.2%) 2.49 MB – 2.51 MB
Unused CSS	192 kB	↑ +531 B (+0.3%) 191 kB – 192 kB

Metric

Value

Change / range

Trend

Page Weight

9.72 MB

↓ -551.9 kB (-5.5%) 9.05 MB – 10.69 MB

Requests

133

↑ +1 (+0.8%) 125 – 133

Third-party Weight

5.43 MB

↓ -563.8 kB (-9.6%) 4.80 MB – 6.43 MB

Third-party CPU

132 ms

↓ -51 ms (-27.8%) significant 132 ms – 195 ms

Unused JS

2.51 MB

↑ +5.7 kB (+0.2%) 2.49 MB – 2.51 MB

Unused CSS

192 kB

↑ +531 B (+0.3%) 191 kB – 192 kB

By resource type

Type	Share	Size	Requests
image	52.6%	5.11 MB	29
script	35.5%	3.45 MB	49
font	7.8%	758 kB	5
other	2.7%	260 kB	28
stylesheet	1.4%	139 kB	20
document	<0.1%	2.6 kB	1
Total		9.72 MB	133

Third parties 8 entities

Entity	Transfer	Size	Main thread Simulated
imgix	image	5.11 MB	0 ms
Accessibe Accessibility Overlay		236 kB	64 ms
Google Fonts		27.6 kB	0 ms
Cookie-Script.com		26.3 kB	51 ms
Rollbar		25.3 kB	15 ms
All 8		5.43 MB	132 ms

Entity

Transfer

Size

Main thread Simulated

imgix

image

5.11 MB

0 ms

Accessibe Accessibility Overlay

236 kB

64 ms

Google Fonts

27.6 kB

0 ms

Cookie-Script.com

26.3 kB

51 ms

Rollbar

25.3 kB

15 ms

All 8

5.43 MB

132 ms

Page health

Metric	Value	Change / range
Main Thread Work	23.83 s	↑ +1441 ms (+6.4%) significant 22.39 s – 23.83 s
Long Tasks	20	→ no change 20 – 20
DOM Elements	1,571	↑ +34 (+2.2%) 1,486 – 1,571
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)	7	→ no change 4 – 8
A11y Failures	4	→ no change 4 – 4
A11y Failing Nodes	16	↓ -1 (-5.9%) 12 – 18

Metric

Value

Change / range

Trend

Main Thread Work

23.83 s

↑ +1441 ms (+6.4%) significant 22.39 s – 23.83 s

Long Tasks

→ no change 20 – 20

DOM Elements

1,571

↑ +34 (+2.2%) 1,486 – 1,571

Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)

→ no change 4 – 8

A11y Failures

→ no change 4 – 4

A11y Failing Nodes

↓ -1 (-5.9%) 12 – 18

Main thread work

Task	Share	Duration Simulated
script evaluation	75%	17.87 s
other	11%	2.73 s
script parse compile	5%	1.16 s
style layout	4%	840 ms
garbage collection	3%	752 ms
paint composite render	2%	412 ms
parse HTML	0%	76 ms
Total		23.83 s

Task

Time

Duration Simulated

script evaluation

75%

17.87 s

other

11%

2.73 s

script parse compile

1.16 s

style layout

840 ms

garbage collection

752 ms

paint composite render

412 ms

parse HTML

76 ms

Total

23.83 s

Axe violations axe-core 4.13.0, full rule set

7 violating nodes across 5 rules, 3752 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

serious color-contrast — Elements must meet minimum color contrast ratio thresholds 3 nodes
moderate heading-order — Heading levels should only increase by one 1 node
moderate landmark-no-duplicate-contentinfo — Document should not have more than one contentinfo landmark 1 node
moderate landmark-unique — Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 1 node
moderate meta-viewport — Zooming and scaling must not be disabled 1 node

Accessibility failures 4 of 36 audits

label-content-name-mismatch — Elements with visible text labels do not have matching accessible names. 11 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

Best Practices failures 2 of 20 audits

errors-in-console — Browser errors were logged to the console 1 item
valid-source-maps — Missing source maps for large first-party JavaScript 3 items

SEO failures 1 of 10 audits

link-text — Links do not have descriptive text 1 item

Hygiene

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

Measurement log

Field history 25 weeks

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

Week ending	LCP	INP	CLS	FCP	TTFB
2026-09-05	6.32 s	842 ms	0.450	1.45 s	549 ms
2026-08-29	6.40 s	959 ms	0.440	1.54 s	565 ms
2026-08-22	6.00 s	962 ms	0.430	1.62 s	605 ms
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

Week ending

LCP

INP

CLS

FCP

TTFB

2026-09-05

6.32 s

842 ms

0.450

1.45 s

549 ms

2026-08-29

6.40 s

959 ms

0.440

1.54 s

565 ms

2026-08-22

6.00 s

962 ms

0.430

1.62 s

605 ms

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

Runs

Every stored run for this URL, newest first.

When	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took	Archive
Sep 11, 2026, 8:44 AM UTC	5	38.54 s	0.476	8.10 s	9.72 MB	3/3	±5	2,406 -3%	89.4s	Wayback
Sep 4, 2026, 5:49 AM UTC	7	41.59 s	0.365	7.07 s	10.28 MB	3/3	±2	2,241 -10%	90.2s	Wayback
Aug 28, 2026, 1:23 AM UTC	5	38.04 s	0.477	7.45 s	9.05 MB	3/3	±6	2,456 -1%	94.4s	Wayback
Aug 20, 2026, 7:07 PM UTC	8	38.30 s	0.349	7.56 s	10.69 MB	3/3	±6	2,487 0%	94.4s	Wayback

When

Scores

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Embed this score

Use this web component to show birkscinema.co.uk's scores on any website, updated whenever this instance re-measures. Don’t forget to bundle the speedlify2-score.js component code into your site!

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Stack

Lighthouse Scores LAB 🤖 Simulated

Metrics LAB FIELD

LCP Subparts LAB 🐇 Unthrottled

LCP LAB 🤖 Simulated vs LCP FIELD

Page weight

By resource type

Third parties 8 entities

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

Accessibility failures 4 of 36 audits

Best Practices failures 2 of 20 audits

SEO failures 1 of 10 audits

Hygiene

Measurement log

Field history 25 weeks

Runs

Embed this score

Lighthouse Scores LAB Simulated

LCP Subparts LAB Unthrottled

LCP LAB Simulated vs LCP FIELD