Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
5.37 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
36.12 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.92 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.188
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
20.33 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.
54.54 s
Page Load Progression
663 ms 1.3 s 2.0 s 2.7 s 3.3 s
4.0 s
4.6 s
5.3 sFPage Weight BudgetAction8.6 MB transferred, 222 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction10941ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 2324ms | 71ms | 0ms | 3rd |
| https://www.mimecast.com/ | 2099ms | 70ms | 5ms | 3rd |
| https://fpjscdn.net/v3/9bsIAwFA2Yvt74r1OAYZ | 1519ms | 1149ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-M2787TN | 1222ms | 1011ms | 101ms | 3rd |
| https://unpkg.com/@lottiefiles/dotlottie-wc@0.9.12/dist/dist-ClwrCxoa.js | 569ms | 557ms | 1ms | 3rd |
| https://cdn.optimizely.com/js/30177210136.js | 536ms | 441ms | 70ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-987806786&cx=c>m=4e64h1 | 459ms | 351ms | 92ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-2RRJFGC554&cx=c>m=4e64h1 | 445ms | 360ms | 69ms | 3rd |
| https://www.mimecast.com/dist/site.ff160e92f68ef966136a.js | 398ms | 281ms | 98ms | 3rd |
| https://scripts.clarity.ms/0.8.59-beta/clarity.js | 297ms | 248ms | 11ms | 3rd |
Showing top 10 of 20 scripts
FJS BundlesAction51 scripts, 1.1 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.mimecast.com/dist/site.ff160e92f68ef966136a.js | 723 KB | 650 KB (90%) | ✓ | 3rd |
| https://rtp-static.marketo.com/rtp/libs/jqueryui/1.13.2/jquery-custom-ui.min.js | 126 KB | 106 KB (85%) | ✗ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202405.1.0/otBannerSdk.js | 109 KB | 68 KB (62%) | ✓ | 3rd |
| https://cdn.optimizely.com/js/30177210136.js | 145 KB | 64 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-2RRJFGC554&cx=c>m=4e64h1 | 170 KB | 64 KB (37%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-M2787TN | 187 KB | 62 KB (33%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-987806786&cx=c>m=4e64h1 | 145 KB | 56 KB (39%) | ✓ | 3rd |
| https://cdn.mouseflow.com/projects/e24f7e3a-5c9e-4ded-b913-3026146c2cf7.js | 53 KB | 40 KB (76%) | ✓ | 3rd |
| https://unpkg.com/@lottiefiles/dotlottie-wc@0.9.12/dist/dist-ClwrCxoa.js | 33 KB | 31 KB (95%) | ✓ | 3rd |
| https://lonrtp1-cdn.marketo.com/rtp-api/v1/rtp.js?aid=mimecast | 42 KB | 25 KB (61%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction222 resources · 8.6 MB · 1.1 MB savings availableFIX
~1.1 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 222 resources | 8.6 MiB | ||||||
CImage OptimizationAction100 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (250 KB)PASS
Web fonts
6
250 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)
Fixing the unchecked items could save ~77 KB and ~154 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AHTTP Cachingmax-age=10368000 (17 weeks)PASS
public, max-age=10368000
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 10368000 | Cache for 17 weeks |
Network Waterfall222 requests over 11598msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 2324ms | 0 KB | — | £34/mo | Costly |
www.mimecast.com www.mimecast.com | Other | 2099ms | 28 KB | — | £31/mo | Costly |
fpjscdn.net fpjscdn.net | Other | 1519ms | 65 KB | — | £22/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 1222ms | 187 KB | 33% | £18/mo | Costly |
unpkg unpkg.com | CDN | 569ms | 33 KB | 95% | £8/mo | Costly |
Optimizely cdn.optimizely.com | A/B Testing | 536ms | 145 KB | 44% | £8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 459ms | 145 KB | 39% | £7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 445ms | 170 KB | 37% | £7/mo | Costly |
www.mimecast.com www.mimecast.com | Other | 398ms | 723 KB | 90% | £6/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 297ms | 26 KB | — | £4/mo | Costly |
j.6sc.co j.6sc.co | Other | 218ms | 19 KB | — | £3/mo | Costly |
lonrtp1-cdn.marketo.com lonrtp1-cdn.marketo.com | Other | 173ms | 42 KB | 61% | £3/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 164ms | 109 KB | 62% | £2/mo | Essential |
rtp-static.marketo.com rtp-static.marketo.com | Other | 129ms | 126 KB | 85% | £2/mo | Optional |
LinkedIn Insight snap.licdn.com | Advertising | 74ms | 19 KB | — | £1/mo | Optional |
rtp-static.marketo.com rtp-static.marketo.com | Other | 69ms | 6 KB | — | £1/mo | Optional |
rtp-static.marketo.com rtp-static.marketo.com | Other | 66ms | 30 KB | — | £1/mo | Optional |
cdn.mouseflow.com cdn.mouseflow.com | Other | 65ms | 53 KB | 76% | £1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 63ms | 9 KB | — | £1/mo | Essential |
jsDelivr cdn.jsdelivr.net | CDN | 52ms | 10 KB | — | £1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 2324ms and costs ~£34/month
- www.mimecast.com adds 2099ms and costs ~£31/month
- fpjscdn.net adds 1519ms and costs ~£22/month
- Google Tag Manager adds 1222ms and costs ~£18/month
- unpkg adds 569ms and costs ~£8/month
- Optimizely adds 536ms and costs ~£8/month
- Google Tag Manager adds 459ms and costs ~£7/month
- Google Tag Manager adds 445ms and costs ~£7/month
- www.mimecast.com adds 398ms and costs ~£6/month
- Microsoft Clarity adds 297ms and costs ~£4/month
- j.6sc.co adds 218ms and costs ~£3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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 2324ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.mimecast.com takes 2099ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
fpjscdn.net takes 1519ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 1222ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
unpkg takes 569ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
95% of unpkg's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Optimizely takes 536ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 459ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 445ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.mimecast.com takes 398ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
90% of www.mimecast.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Microsoft Clarity takes 297ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
j.6sc.co takes 218ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
61% of lonrtp1-cdn.marketo.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
62% of OneTrust's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
85% of rtp-static.marketo.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
76% of cdn.mouseflow.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev