lookback.com

https://www.lookback.com/

Ranks Overall #1,584 11ty Emeritus

Data from Sep 21, 2026, 7:40 AM UTC 17d old Measured once a month · 5 runs since Aug 21, 2026

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

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

Stack

Hu Built with HubSpot

Uses React

Hosted by Cloudflare

Lighthouse Scores LAB Simulated

Performance

↓ -3 (-4.2%)

Accessibility

no change

Best Practices

no change

100

SEO

no change

Metrics LAB FIELD

Core Web Vitals: passing 2 of 3 assessed from real Chrome users.

Field figures are the p75 across real Chrome users over a 28-day trailing window (2026-08-23 → 2026-09-19), url-level.

Metric	Lab Simulated	Field
LCP CWV Largest Contentful Paint	5.56 s poor	↓ -618 ms (-10%) 5.06 s – 6.18 s	2.09 s good	84.3% 10.1% 5.6%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	—	—
CLS CWV Cumulative Layout Shift	0.051 good	↑ +0.021 (+70%) significant 0.030 – 0.051	0.040 good	83.4% 16.6% 0%
TBT Total Blocking Time	280 ms needs work	↑ +96 ms (+52.2%) 184 ms – 421 ms	n/a	—
FCP First Contentful Paint	3.08 s poor	↑ +501 ms (+19.5%) significant 2.44 s – 3.08 s	1.58 s good	77.3% 11.8% 10.9%
Speed Index	3.08 s good	↑ +501 ms (+19.5%) significant 2.44 s – 3.08 s	n/a	—
TTFB Time to First Byte	490 ms good	↓ -24 ms (-4.7%) 490 ms – 634 ms	771 ms good	76% 14.2% 9.8%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

5.56 s poor

↓ -618 ms (-10%) 5.06 s – 6.18 s

2.09 s good

84.3% 10.1% 5.6%

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

n/a

—

CLS CWV Cumulative Layout Shift

0.051 good

↑ +0.021 (+70%) significant 0.030 – 0.051

0.040 good

83.4% 16.6% 0%

TBT Total Blocking Time

280 ms needs work

↑ +96 ms (+52.2%) 184 ms – 421 ms

n/a

—

FCP First Contentful Paint

3.08 s poor

↑ +501 ms (+19.5%) significant 2.44 s – 3.08 s

1.58 s good

77.3% 11.8% 10.9%

Speed Index

3.08 s good

↑ +501 ms (+19.5%) significant 2.44 s – 3.08 s

n/a

—

TTFB Time to First Byte

490 ms good

↓ -24 ms (-4.7%) 490 ms – 634 ms

771 ms good

76% 14.2% 9.8%

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 137 ms

element render delay 118 ms

resource load duration 41 ms

time to first byte 23 ms

LCP LAB Simulated vs LCP FIELD

Lab 5.56 s

Field p75 2.09 s

The lab LCP is 2.66× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	52.63 MB	↑ +443.6 kB (+0.9%) 51.87 MB – 54.50 MB
Requests	93	↑ +2 (+2.2%) 81 – 93
Third-party Weight	491 kB	↑ +15.2 kB (+3.3%) 475 kB – 491 kB
Third-party CPU	150 ms	↑ +12 ms (+9%) 137 ms – 153 ms
Unused JS	77.5 kB	↓ -75 B (-0.1%) 77.4 kB – 77.6 kB
Unused CSS	0 B	→ no change 0 B – 0 B

Metric

Value

Change / range

Trend

Page Weight

52.63 MB

↑ +443.6 kB (+0.9%) 51.87 MB – 54.50 MB

Requests

↑ +2 (+2.2%) 81 – 93

Third-party Weight

491 kB

↑ +15.2 kB (+3.3%) 475 kB – 491 kB

Third-party CPU

150 ms

↑ +12 ms (+9%) 137 ms – 153 ms

Unused JS

77.5 kB

↓ -75 B (-0.1%) 77.4 kB – 77.6 kB

Unused CSS

0 B

→ no change 0 B – 0 B

By resource type

Type	Share	Size	Requests
media	98.3%	51.72 MB	3
script	0.8%	437 kB	22
image	0.5%	282 kB	22
font	0.2%	128 kB	3
stylesheet	<0.1%	26.0 kB	19
other	<0.1%	20.4 kB	21
document	<0.1%	15.7 kB	1
Total		52.63 MB	93

Type

Transfer

Size

Requests

media

98.3%

51.72 MB

script

0.8%

437 kB

image

0.5%

282 kB

font

0.2%

128 kB

stylesheet

<0.1%

26.0 kB

other

<0.1%

20.4 kB

document

<0.1%

15.7 kB

Total

52.63 MB

Third parties 5 entities

Entity	Transfer	Size	Main thread Simulated
Hubspot	script	300 kB	135 ms
hubspotusercontent-na1.net	font	81.5 kB	1 ms
Google Fonts	font	63.9 kB	0 ms
usemessages.com		29.0 kB	12 ms
Unpkg		16.8 kB	3 ms
Total		491 kB	150 ms

Entity

Transfer

Size

Main thread Simulated

Hubspot

script

300 kB

135 ms

hubspotusercontent-na1.net

font

81.5 kB

1 ms

Google Fonts

font

63.9 kB

0 ms

usemessages.com

29.0 kB

12 ms

Unpkg

16.8 kB

3 ms

Total

491 kB

150 ms

Page health

Metric	Value	Change / range
Main Thread Work	4.07 s	↑ +941 ms (+30.1%) significant 3.13 s – 4.07 s
Long Tasks	12	↑ +3 (+33.3%) 9 – 13
DOM Elements	578	→ no change 578 – 578
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)	20	→ no change 20 – 21
A11y Failures	3	→ no change 3 – 3
A11y Failing Nodes	12	→ no change 12 – 12

Metric

Value

Change / range

Trend

Main Thread Work

4.07 s

↑ +941 ms (+30.1%) significant 3.13 s – 4.07 s

Long Tasks

↑ +3 (+33.3%) 9 – 13

DOM Elements

578

→ no change 578 – 578

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

→ no change 20 – 21

A11y Failures

→ no change 3 – 3

A11y Failing Nodes

→ no change 12 – 12

Main thread work

Task	Share	Duration Simulated
other	43%	1.76 s
script evaluation	32%	1.31 s
style layout	15%	619 ms
script parse compile	4%	164 ms
paint composite render	3%	123 ms
parse HTML	2%	73 ms
garbage collection	0%	15 ms
Total		4.07 s

Task

Time

Duration Simulated

other

43%

1.76 s

script evaluation

32%

1.31 s

style layout

15%

619 ms

script parse compile

164 ms

paint composite render

123 ms

parse HTML

73 ms

garbage collection

15 ms

Total

4.07 s

Axe violations axe-core 4.13.0, full rule set

20 violating nodes across 7 rules, 1020 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

moderate heading-order — Heading levels should only increase by one 7 nodes
serious color-contrast — Elements must meet minimum color contrast ratio thresholds 4 nodes
moderate region — All page content should be contained by landmarks 4 nodes
moderate landmark-unique — Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 2 nodes
moderate landmark-main-is-top-level — Main landmark should not be contained in another landmark 1 node
moderate landmark-no-duplicate-main — Document should not have more than one main landmark 1 node
serious link-name — Links must have discernible text 1 node

Accessibility failures 3 of 32 audits

heading-order — Heading elements are not in a sequentially-descending order 7 nodes
color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 4 nodes
link-name — Links do not have a discernible name 1 node

Best Practices failures 2 of 20 audits

third-party-cookies — Uses third-party cookies 8 items
inspector-issues — Issues were logged in the `Issues` panel in Chrome Devtools 1 item

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h3

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
2026-09-26	2.10 s	113 ms	0.080	1.85 s	876 ms
2026-09-19	2.09 s	—	0.040	1.58 s	771 ms
2026-09-12	2.12 s	—	0.080	1.98 s	812 ms
2026-09-05	2.20 s	—	0.060	1.83 s	812 ms
2026-08-29	1.98 s	—	0.040	1.71 s	726 ms
2026-08-22	2.20 s	114 ms	0.060	1.91 s	760 ms
2026-08-15	2.82 s	—	0.040	2.05 s	881 ms
2026-08-08	2.76 s	—	0.030	1.98 s	773 ms
2026-08-01	2.74 s	103 ms	0.030	1.98 s	819 ms
2026-07-25	2.60 s	—	0.010	1.93 s	881 ms
2026-07-18	2.36 s	—	0.050	1.71 s	808 ms
2026-07-11	2.12 s	103 ms	0.010	1.73 s	808 ms

Runs

Every stored run for this URL, newest first.

When	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took	Archive
Sep 21, 2026, 7:40 AM UTC	68	5.56 s	0.051	280 ms	52.63 MB	3/3	±30	2,454 -1%	94.6s	Wayback
Sep 14, 2026, 12:52 AM UTC	71	6.18 s	0.030	184 ms	52.17 MB	3/3	±38	2,971 +19%	91.3s	Wayback
Sep 6, 2026, 11:38 PM UTC	66	5.13 s	0.051	412 ms	52.56 MB	3/3	±7	2,488 0%	93.3s	Wayback
Aug 30, 2026, 11:21 PM UTC	68	5.06 s	0.051	421 ms	51.87 MB	3/3	±17	2,486 0%	94.6s	Wayback
Aug 21, 2026, 6:44 PM UTC	70	5.59 s	0.051	291 ms	54.50 MB	3/3	±14	2,348 -6%	93s	Wayback

When

Scores

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

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 5 entities

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

Accessibility failures 3 of 32 audits

Best Practices failures 2 of 20 audits

Hygiene

Measurement log

Field history 25 weeks

Runs

Lighthouse Scores LAB Simulated

LCP Subparts LAB Unthrottled

LCP LAB Simulated vs LCP FIELD