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

Best Practices

100

SEO

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

1.38 s

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

2.08 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.

0.005

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

1.93 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.

2.08 s

Page Load Progression

826 ms

1.7 s

2.5 s

3.3 s

4.1 s

5.0 s

5.8 s

6.6 s

Checks

6 PASS 5 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 (1.4 MiB of 1.4 MiB)

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.

Page Weight Budget

1.4 MB transferred, 57 requests

REVIEW

1.4 MB transferred, 57 requests

Page weighs 1.9 MB (1.4 MB transferred)

Images are 1.1 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.1 MB

57 HTTP requests

Estimated 0.29 g CO2 per page load

1.4 MB transferred

57 requests

0.29 g CO2 per page load

Images 1.1 MiB 80%

JavaScript 164.3 KiB 12%

Fonts 65.7 KiB 5%

CSS 34.1 KiB 2%

HTML 12.2 KiB 1%

Other 4.8 KiB 0%

Other 2.5 KiB 0%

Other 1.3 KiB 0%

0 2.4 MB 4.9 MB

Under budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Image Optimization

26 images, 0 KB saveable

REVIEW

26 images, 0 KB saveable

All images are well-optimized

26 images 1.1 MB

0 oversized -0 KB

24 legacy format

0 missing dimensions CLS risk

JS Bundles

7 scripts, 77 KB unused

REVIEW

7 scripts, 77 KB unused

https://mc.yandex.ru/metrika/tag.js: 44 KB unused (52%)

Consider code splitting or tree shaking to reduce unused code.

https://www.tomsk.ru/wp-content/themes/tomsktheme/...: 33 KB unused (86%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 77 KB

77 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://mc.yandex.ru/metrika/tag.js	85 KB	44 KB (52%)	✓	3rd
https://www.tomsk.ru/wp-content/themes/tomsktheme/assets/js/scripts.js?ver=6	38 KB	33 KB (86%)	✓	3rd
https://www.tomsk.ru/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	30 KB	—	✓	3rd
https://www.tomsk.ru/wp-content/plugins/on_banners/main_on.js?ver=1687441502	2 KB	—	✓	3rd
https://www.tomsk.ru/wp-content/plugins/contact-form-7/includes/swv/js/index.js?ver=5.7.5.1	3 KB	—	✓	3rd
https://www.tomsk.ru/wp-content/plugins/contact-form-7/includes/js/index.js?ver=5.7.5.1	4 KB	—	✓	3rd
https://www.tomsk.ru/wp-content/themes/tomsktheme/assets/js/main.js?ver=6	2 KB	—	✓	3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Page Weight Inventory

Action

57 resources · 1.4 MB · 77 KB savings available

REVIEW

57 resources · 1.4 MB · 77 KB savings available

Page weight 380 KB over 1MB target

Got: 1.4 MB Expected: ≤ 1 MB

~77 KB of savings available

56 third-party resources (100% of weight)

1 resources over 200KB

57 resources · 1.4 MiB · 56 third-party 379.9 KiB over 1MB target

Image 80% · 1.1 MiB

JavaScript 12% · 164.3 KiB

Font 5% · 65.7 KiB

CSS 2% · 34.1 KiB

Document 1% · 12.3 KiB

Other 1% · 7.3 KiB

~77.1 KiB of savings available

Remove unused JavaScript: 77.1 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

57 resources			1.4 MiB

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

491ms total JS execution

PASS

491ms total JS execution

https://www.tomsk.ru/: 150ms CPU time

Unattributable: 141ms CPU time

https://mc.yandex.ru/metrika/tag.js: 131ms CPU time

https://www.tomsk.ru/wp-includes/js/jquery/jquery....: 69ms CPU time

Third-party scripts: 491ms (100% of total)

Main Thread Breakdown

Other 37% Script Evaluation 34% Style & Layout 15% Rendering 6% Script Parsing & Compilation 4% Parse HTML & CSS 3%

Script	Total	Scripting	Parse/Compile	Party
https://www.tomsk.ru/	150ms	7ms	4ms	3rd
Unattributable	141ms	7ms	0ms	3rd
https://mc.yandex.ru/metrika/tag.js	131ms	116ms	7ms	3rd
https://www.tomsk.ru/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	69ms	41ms	3ms	3rd

A+

Font Loading

2 fonts (66 KB)

PASS

2 fonts (66 KB)

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

Web fonts

66 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

UcC73FwrK3iLTeHuS_nVMrM... woff2 swap

Size 47 KB

Load time 15 ms

Start 1.9 s

Risk FOUT — text flashes from fallback to web font

UcC73FwrK3iLTeHuS_nVMrM... woff2 swap

Size 18 KB

Load time 15 ms

Start 1.9 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+

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

Network Waterfall

57 requests over 5007ms

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 491ms · 127KB · ₽145/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.tomsk.ru www.tomsk.ru	Other	150ms	12 KB	—	₽44/mo	Optional
Unattributable Unattributable	Other	141ms	0 KB	—	₽42/mo	Optional
mc.yandex.ru mc.yandex.ru	Other	131ms	85 KB	52%	₽39/mo	Optional
www.tomsk.ru www.tomsk.ru	Other	69ms	30 KB	—	₽20/mo	Optional

www.tomsk.ru

Other

Optional

Execution 150ms

Transfer 12 KB

Monthly Cost ₽44/mo

Unattributable

Other

Optional

Execution 141ms

Transfer 0 KB

Monthly Cost ₽42/mo

mc.yandex.ru

Other

Optional

Execution 131ms

Transfer 85 KB

Unused 52%

Monthly Cost ₽39/mo

www.tomsk.ru

Other

Optional

Execution 69ms

Transfer 30 KB

Monthly Cost ₽20/mo

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

52% of mc.yandex.ru's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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.