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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
2
REVIEW
5
PASS
6
INFO
2

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

Mobile Desktop
70
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

788 ms

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

2.45 s

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

90 ms

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

0.254

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

1.85 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.

2.52 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
15
6 PASS 5 REVIEW 2 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.1 MiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
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.

B
Page Weight Budget
1.1 MB transferred, 70 requests
REVIEW
1.1 MB transferred, 70 requests
Info::
Page weighs 2.9 MB (1.1 MB transferred)
Warning::
JavaScript is 591 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 591 KB
Info::
70 HTTP requests
Info::
Estimated 0.23 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
70 requests
0.23 g CO2 per page load
JavaScript 590.9 KiB 53%
Images 388.4 KiB 35%
CSS 44.8 KiB 4%
HTML 42.0 KiB 4%
Fonts 36.6 KiB 3%
Other 3.5 KiB 0%
Other 2.9 KiB 0%
Other 1.1 KiB 0%
Other 199 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

C
Image Optimization
Action
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAC4A... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ietp-web-app-global-assets.azurewebsites.n... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ietp-web-app-global-assets.azurewebsites.n... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ietp-web-app-global-assets.azurewebsites.n... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ietp-web-app-global-assets.azurewebsites.n... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ietp-web-app-global-assets.azurewebsites.n... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ietp-web-app-global-assets.azurewebsites.n... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.theiet.org/media/2563/untitled-7.jpg?f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 388 KB
0 oversized -0 KB
8 legacy format
8 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

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

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

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

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

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

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

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

C
JS Execution Cost
Action
1234ms total JS execution
REVIEW
1234ms total JS execution
Warning::
https://www.theiet.org/: 403ms CPU time
Info::
https://consent.cookiebot.com/32853404-389a-468c-9...: 178ms CPU time
Info::
https://static.responsetap.com/static/scripts/rTap...: 164ms CPU time
Info::
https://www.theiet.org/Themes/base/js/index-faeb52...: 151ms CPU time
Info::
Unattributable: 147ms CPU time
Warning::
Third-party scripts: 1234ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Style & Layout 20% Other 19% Parse HTML & CSS 9% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.theiet.org/403ms53ms2ms3rd
https://consent.cookiebot.com/32853404-389a-468c-95fb-79ebc39057ef/cc.js?renew=false&referer=www.theiet.org&dnt=false&init=false178ms73ms12ms3rd
https://static.responsetap.com/static/scripts/rTapTrack.min.js164ms140ms3ms3rd
https://www.theiet.org/Themes/base/js/index-faeb5270.js151ms81ms0ms3rd
Unattributable147ms14ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N9QX7R7W86ms68ms15ms3rd
https://www.theiet.org/_Incapsula_Resource?SWJIYLWA=5074a744e2e3d891814e9a2dace20bd4,719d34d31c8e3a6e6fffd425f7e032f354ms41ms3ms3rd
https://consent.cookiebot.com/uc.js?cbid=32853404-389a-468c-95fb-79ebc39057ef&implementation=gtm&consentmode-dataredaction=dynamic52ms44ms3ms3rd
B
JS Bundles
31 scripts, 125 KB unused
REVIEW
31 scripts, 125 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N9Q...: 57 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.theiet.org/Themes/base/js/index-05f433...: 34 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.theiet.org/Themes/base/js/index-05f433...: unminified — 13 KB could be saved
Warning::
https://consent.cookiebot.com/32853404-389a-468c-9...: 34 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 125 KB
125 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-N9QX7R7W149 KB57 KB (38%)✓3rd
https://www.theiet.org/Themes/base/js/index-05f4331b.js38 KB34 KB (90%)✗3rd
https://consent.cookiebot.com/32853404-389a-468c-95fb-79ebc39057ef/cc.js?renew=false&referer=www.theiet.org&dnt=false&init=false106 KB34 KB (32%)✓3rd
https://www.theiet.org/Themes/base/js/iet-global-bar.entry.js4 KB—✓3rd
https://www.theiet.org/Themes/base/js/iet-homepage-banner.entry.js3 KB—✓3rd
https://www.theiet.org/Themes/base/js/app-globals-0f993ce5.js0 KB—✓3rd
https://rum-agent.na-01.cloud.solarwinds.com/ra-e-1780603686429937664.js27 KB—✓3rd
https://www.theiet.org/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3&ns=3&cb=104491587921 KB—✓3rd
https://www.theiet.org/Themes/base/js/main.js?v=13.3.09 KB—✗3rd
https://js.monitor.azure.com/scripts/b/ai.2.min.js46 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

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

C
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
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
2 fonts (37 KB)
PASS
2 fonts (37 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

37 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 788 ms LCP 2.5 shttps://use.typekit.net/af/1db03a/00000000000000007735a08e/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/1db03a/00000000000000007735a08e/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 18.1 KiB — 17 ms — font-display: swaphttps://use.typekit.net/af/ebcd51/00000000000000007735a081/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/ebcd51/00000000000000007735a081/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 18.4 KiB — 21 ms — font-display: swap
l woff2 swap
Size 18 KB
Load time 17 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 18 KB
Load time 21 ms
Start 1.4 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
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
70 resources · 1.1 MB · 125 KB savings available
PASS
70 resources · 1.1 MB · 125 KB savings available
Warning::
Page weight 86 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~125 KB of savings available
Warning::
69 third-party resources (100% of weight)
70 resources · 1.1 MiB · 69 third-party 86.5 KiB over 1MB target
JavaScript 53% · 591.0 KiB
Image 35% · 391.9 KiB
CSS 4% · 44.8 KiB
Document 4% · 42.0 KiB
Font 3% · 36.6 KiB
Other 0% · 4.3 KiB

~124.8 KiB of savings available

Remove unused JavaScript: 124.8 KiB
Network Waterfall
70 requests over 5696ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 788 ms LCP 2.5 shttps://theiet.org// https://theiet.org/ — 301 — 54 B — 11 ms — h2https://www.theiet.org/www.theiet.org/ https://www.theiet.org/ — 200 — 577 B — 13 ms — h2https://www.theiet.org/_Incapsula_Resource?SWJIYLWA=5074a744e2e3d891814e9a2dace20bd4,719d34d31c8e3a6e6fffd425f7e032f3www.theiet.org/_Incapsula_Resource?... https://www.theiet.org/_Incapsula_Resource?SWJIYLWA=5074a744e2e3d891814e9a2dace20bd4,719d34d31c8e3a6e6fffd425f7e032f3 — 200 — 24.8 KiB — 11 ms — h2https://www.theiet.org/_Incapsula_Resource?SWHANEDL=377483417533319724,17540029701023786285,365203276805501242,311707www.theiet.org/_Incapsula_Resource?... https://www.theiet.org/_Incapsula_Resource?SWHANEDL=377483417533319724,17540029701023786285,365203276805501242,311707 — 200 — 57 B — 14 ms — h2https://www.theiet.org/www.theiet.org/ https://www.theiet.org/ — 200 — 40.7 KiB — 475 ms — h2https://www.theiet.org/_Incapsula_Resource?SWKMTFSR=1&e=0.6216491269839314www.theiet.org/_Incapsula_Resource?... https://www.theiet.org/_Incapsula_Resource?SWKMTFSR=1&e=0.6216491269839314 — 200 — 36 B — 16 ms — h2https://www.theiet.org/_Incapsula_Resource?ES2LURCT=67&t=78&d=complete%20(s%3A1%2Cc%3A18%2Cr%3A205)www.theiet.org/_Incapsula_Resource?... https://www.theiet.org/_Incapsula_Resource?ES2LURCT=67&t=78&d=complete%20(s%3A1%2Cc%3A18%2Cr%3A205) — -1 — 0 B — 0 ms — https://www.theiet.org/Themes/base/js/cmstoolkit-components.esm.jswww.theiet.org/Themes/base/js/cmsto... https://www.theiet.org/Themes/base/js/cmstoolkit-components.esm.js — 200 — 5.1 KiB — 664 ms — h2https://use.typekit.net/eag8ezh.cssuse.typekit.net/eag8ezh.css https://use.typekit.net/eag8ezh.css — 200 — 979 B — 22 ms — h2https://fonts.googleapis.com/icon?family=Material+Icons&display=swapfonts.googleapis.com/icon?family=Ma... https://fonts.googleapis.com/icon?family=Material+Icons&display=swap — 200 — 823 B — 88 ms — h2https://p.typekit.net/p.css?s=1&k=eag8ezh&ht=tk&f=15528.15530.17252.17253&a=14946669&app=typekit&e=cssp.typekit.net/p.css?s=1&k=eag8ezh&h... https://p.typekit.net/p.css?s=1&k=eag8ezh&ht=tk&f=15528.15530.17252.17253&a=14946669&app=typekit&e=css — 200 — 172 B — 25 ms — h2https://www.theiet.org/Themes/base/css/styles.min.css?v=13.3.0www.theiet.org/Themes/base/css/styl... https://www.theiet.org/Themes/base/css/styles.min.css?v=13.3.0 — 200 — 42.4 KiB — 857 ms — h2https://www.theiet.org/Themes/base/js/main.js?v=13.3.0www.theiet.org/Themes/base/js/main.... https://www.theiet.org/Themes/base/js/main.js?v=13.3.0 — 200 — 9.4 KiB — 656 ms — h2https://fonts.googleapis.com/css2?family=Material+Symbols+Sharp:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200fonts.googleapis.com/css2?family=Ma... https://fonts.googleapis.com/css2?family=Material+Symbols+Sharp:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200 — 200 — 449 B — 42 ms — h2https://ietp-web-app-global-assets.azurewebsites.net/media/2zycdsf5/instagram.svgietp-web-app-global-assets.azureweb... https://ietp-web-app-global-assets.azurewebsites.net/media/2zycdsf5/instagram.svg — 200 — 2.1 KiB — 578 ms — http/1.1https://ietp-web-app-global-assets.azurewebsites.net/media/tfqfqayy/linkedin.svgietp-web-app-global-assets.azureweb... https://ietp-web-app-global-assets.azurewebsites.net/media/tfqfqayy/linkedin.svg — 200 — 1.3 KiB — 578 ms — http/1.1https://www.theiet.org/Themes/base/js/index-faeb5270.jswww.theiet.org/Themes/base/js/index... https://www.theiet.org/Themes/base/js/index-faeb5270.js — 200 — 43.1 KiB — 324 ms — h2https://www.theiet.org/Themes/base/js/app-globals-0f993ce5.jswww.theiet.org/Themes/base/js/app-g... https://www.theiet.org/Themes/base/js/app-globals-0f993ce5.js — 200 — 311 B — 164 ms — h2https://ietp-web-app-global-assets.azurewebsites.net/media/xkxkxlst/youtube.svgietp-web-app-global-assets.azureweb... https://ietp-web-app-global-assets.azurewebsites.net/media/xkxkxlst/youtube.svg — 200 — 1.3 KiB — 154 ms — http/1.1https://ietp-web-app-global-assets.azurewebsites.net/media/13ghi50o/wechat-icon.pngietp-web-app-global-assets.azureweb... https://ietp-web-app-global-assets.azurewebsites.net/media/13ghi50o/wechat-icon.png — 200 — 7.1 KiB — 142 ms — http/1.1https://ietp-web-app-global-assets.azurewebsites.net/media/pfqdy5jk/weibo-icon.pngietp-web-app-global-assets.azureweb... https://ietp-web-app-global-assets.azurewebsites.net/media/pfqdy5jk/weibo-icon.png — 200 — 24.0 KiB — 176 ms — http/1.1https://rum-agent.na-01.cloud.solarwinds.com/ra-e-1780603686429937664.jsrum-agent.na-01.cloud.solarwinds.co... https://rum-agent.na-01.cloud.solarwinds.com/ra-e-1780603686429937664.js — 200 — 27.0 KiB — 56 ms — h2https://ietp-web-app-global-assets.azurewebsites.net/media/2uao1mok/iet_engx_icon_dark_background.svgietp-web-app-global-assets.azureweb... https://ietp-web-app-global-assets.azurewebsites.net/media/2uao1mok/iet_engx_icon_dark_background.svg — 200 — 1.5 KiB — 173 ms — http/1.1https://www.theiet.org/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3&ns=3&cb=1044915879www.theiet.org/_Incapsula_Resource?... https://www.theiet.org/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3&ns=3&cb=1044915879 — 200 — 20.6 KiB — 26 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-N9QX7R7Wwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-N9QX7R7W — 200 — 149.5 KiB — 132 ms — h2https://js.monitor.azure.com/scripts/b/ai.2.min.jsjs.monitor.azure.com/scripts/b/ai.2... https://js.monitor.azure.com/scripts/b/ai.2.min.js — 200 — 46.2 KiB — 30 ms — h2https://www.theiet.org/media/2563/untitled-7.jpg?format=webp&quality=80&width=419&height=83&v=1d9a8e48edc9190www.theiet.org/media/2563/untitled-... https://www.theiet.org/media/2563/untitled-7.jpg?format=webp&quality=80&width=419&height=83&v=1d9a8e48edc9190 — 200 — 12.9 KiB — 159 ms — h2https://www.theiet.org/media/ql0ewqvb/happy-agronomist-standing-with-laptop-in-field.jpg?format=webp&quality=80&width=1366&height=582&v=1db733490230770www.theiet.org/media/ql0ewqvb/happy... https://www.theiet.org/media/ql0ewqvb/happy-agronomist-standing-with-laptop-in-field.jpg?format=webp&quality=80&width=1366&height=582&v=1db733490230770 — 200 — 26.8 KiB — 192 ms — h2https://www.theiet.org/media/rzkmovpa/cta_6x4_03.webp?format=webp&quality=80&width=742&height=495&v=1dc86010220de30www.theiet.org/media/rzkmovpa/cta_6... https://www.theiet.org/media/rzkmovpa/cta_6x4_03.webp?format=webp&quality=80&width=742&height=495&v=1dc86010220de30 — 200 — 17.6 KiB — 186 ms — h2https://www.theiet.org/media/wrilgzyb/safer-homes.png?format=webp&quality=80&width=742&height=495&v=1dccc151e84c730www.theiet.org/media/wrilgzyb/safer... https://www.theiet.org/media/wrilgzyb/safer-homes.png?format=webp&quality=80&width=742&height=495&v=1dccc151e84c730 — 200 — 43.7 KiB — 374 ms — h2
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Other
Optional
Execution 164ms
Transfer 31 KB
Monthly Cost £2/mo
www.theiet.org
Other
Optional
Execution 151ms
Transfer 43 KB
Monthly Cost £2/mo
Unattributable
Other
Optional
Execution 147ms
Transfer 0 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 86ms
Transfer 149 KB
Unused 38%
Monthly Cost £1/mo
www.theiet.org
Other
Optional
Execution 54ms
Transfer 25 KB
Monthly Cost £1/mo
consent.cookiebot.com
Other
Optional
Execution 52ms
Transfer 27 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.theiet.org adds 403ms and costs ~£4/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

www.theiet.org takes 403ms 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.

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