Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop

Performance

Accessibility

100

Best Practices

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.19 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

2.39 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.006

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

4.04 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.39 s

Page Load Progression

375 ms

750 ms

1.1 s

1.5 s

1.9 s

2.2 s

2.6 s

3.0 s

Checks

8 PASS 3 REVIEW 2 FIX

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (85.3 KiB of 85.6 KiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

HTTP Caching

Action

No cache headers

FIX

No cache headers

No Cache-Control header found

Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

Image Optimization

14 images, 0 KB saveable

REVIEW

14 images, 0 KB saveable

https://storage.consultant.ru/ondb/thumbs/202604/1... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

14 images 39 KB

0 oversized -0 KB

12 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

JS Execution Cost

723ms total JS execution

REVIEW

723ms total JS execution

Unattributable: 454ms CPU time

https://www.consultant.ru/: 269ms CPU time

Third-party scripts: 723ms (100% of total)

Main Thread Breakdown

Other 56% Style & Layout 24% Rendering 10% Garbage Collection 7%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	454ms	4ms	0ms	3rd
https://www.consultant.ru/	269ms	1ms	1ms	3rd

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

86 KB transferred, 24 requests

PASS

86 KB transferred, 24 requests

Page weighs 189 KB (86 KB transferred)

24 HTTP requests

Estimated 0.02 g CO2 per page load

86 KB transferred

24 requests

0.02 g CO2 per page load

Images 38.5 KiB 45%

Fonts 18.6 KiB 22%

CSS 12.4 KiB 14%

HTML 10.9 KiB 13%

JavaScript 4.1 KiB 5%

Other 830 B 1%

Other 303 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

3 fonts (19 KB)

PASS

3 fonts (19 KB)

3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

19 KB total

Render-blocking

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

f2c2442761a05d538011f51... woff2 swap

Size 0 KB

Load time -1558 ms

Start 1.6 s

Risk FOUT — text flashes from fallback to web font

28140c50a81813628ed6c94... woff2 swap

Size 0 KB

Load time -2157 ms

Start 2.2 s

Risk FOUT — text flashes from fallback to web font

45a7a985242d0d9483ac086... woff2 swap

Size 19 KB

Load time 734 ms

Start 2.2 s

Risk FOUT — text flashes from fallback to web font

Optimization checklist

Preload critical fonts (priority=high)
Use woff2 format for all fonts
Set font-display to swap, optional, or fallback
Subset large fonts (≤100 KB each)

A+

JS Bundles

2 scripts, 0 KB unused

PASS

2 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.consultant.ru/static/client/dist/common-3290c0467213eefa31f8d7d5bbed36df.js	0 KB	—	✓	3rd
https://www.consultant.ru/static/client/dist/main-2963a39be38e016f95e10dab55f5224c.js	4 KB	—	✓	3rd

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

Page Weight Inventory

24 resources · 86 KB · 0 KB savings available

PASS

24 resources · 86 KB · 0 KB savings available

Within 1MB page-weight target

Got: 86 KB

23 third-party resources (100% of weight)

24 resources · 85.6 KiB · 23 third-party Within 1MB page-weight target

Image 45% · 38.5 KiB

Font 22% · 18.6 KiB

CSS 14% · 12.4 KiB

Document 13% · 11.2 KiB

JavaScript 5% · 4.1 KiB

Other 1% · 830 B

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

24 resources			85.6 KiB

Network Waterfall

24 requests over 3371ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

100% of JavaScript execution is third-party

First-party Third-party 723ms · 11KB · ₽214/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	454ms	0 KB	—	₽134/mo	Costly
www.consultant.ru www.consultant.ru	Other	269ms	11 KB	—	₽80/mo	Costly

Unattributable

Other

Costly

Execution 454ms

Transfer 0 KB

Monthly Cost ₽134/mo

www.consultant.ru

Other

Costly

Execution 269ms

Transfer 11 KB

Monthly Cost ₽80/mo

These scripts may cost more than they're worth

Unattributable adds 454ms and costs ~₽134/month
www.consultant.ru adds 269ms and costs ~₽80/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 454ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.consultant.ru takes 269ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.