Performance
· 15 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.
1.62 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.96 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
28 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.122
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.19 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.
4.09 s
Page Load Progression
DPage Weight BudgetAction2.2 MB transferred, 155 requestsFIX
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
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
DJS BundlesAction79 scripts, 355 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.idc.com/wp-content/themes/idc2025/dist/scripts.js?m=1775768397g | 93 KB | 74 KB (80%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-Y7CNRMFF6J&cx=c>m=4e64h1h1 | 173 KB | 68 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MLHV83 | 173 KB | 66 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-541ENG1F9X&cx=c>m=4e64h1h1 | 172 KB | 64 KB (37%) | ✓ | 3rd |
| https://info.idc.com/js/forms2/js/forms2.min.js | 67 KB | 52 KB (78%) | ✓ | 3rd |
| https://js.driftt.com/include/1776804900000/r6avhzdbye3d.js | 63 KB | 30 KB (49%) | ✓ | 3rd |
| https://js.driftt.com/core/assets/js/26.9a1a5236.chunk.js | 14 KB | — | ✓ | 3rd |
| https://js.driftt.com/core/assets/js/55.499db05a.chunk.js | 0 KB | — | ✓ | 3rd |
| blob:https://www.idc.com/1cfdd49e-06d6-410c-9637-c7dbc270145e | -0 KB | — | ✓ | 3rd |
| https://consent.trustarc.com/notice?domain=idc.com&c=teconsent&text=true&js=nj¬iceType=bb>m=1 | 6 KB | — | ✓ | 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
DPage Weight InventoryAction155 resources · 2.2 MB · 355 KB savings availableFIX
~354.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 155 resources | 2.2 MiB | ||||||
CImage OptimizationAction19 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
CJS Execution CostAction1208ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 208ms | 15ms | 0ms | 3rd |
| https://www.idc.com/ | 163ms | 14ms | 1ms | 3rd |
| https://js.driftt.com/include/1776804900000/r6avhzdbye3d.js | 151ms | 146ms | 5ms | 3rd |
| https://www.idc.com/wp-content/themes/idc2025/dist/scripts.js?m=1775768397g | 143ms | 68ms | 9ms | 3rd |
| https://consent.trustarc.com/asset/adv-accessible-bundle.js?v=v1.7-1729 | 121ms | 73ms | 0ms | 3rd |
| https://cdn.parsely.com/keys/idc.com/p.js?gtm_ver=3.1 | 101ms | 81ms | 1ms | 3rd |
| https://consent.trustarc.com/asset/notice.js/v/v1.7-1729 | 91ms | 67ms | 2ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MLHV83 | 84ms | 70ms | 11ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-541ENG1F9X&cx=c>m=4e64h1h1 | 80ms | 61ms | 10ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-Y7CNRMFF6J&cx=c>m=4e64h1h1 | 66ms | 55ms | 11ms | 3rd |
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 Loading7 fonts (473 KB)PASS
Web fonts
7
473 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- 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 ~255 KB and ~510 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
AHTTP Cachingmax-age=3600 (1 hour)PASS
max-age=3600
| Directive | Value | Meaning |
|---|---|---|
| max-age | 3600 | Cache for 1 hour |
Network Waterfall155 requests over 8159msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 208ms | 0 KB | — | €4/mo | Costly |
www.idc.com www.idc.com | Other | 163ms | 23 KB | — | €3/mo | Optional |
Drift js.driftt.com | Chat | 151ms | 63 KB | 49% | €3/mo | Optional |
www.idc.com www.idc.com | Other | 143ms | 93 KB | 80% | €2/mo | Optional |
consent.trustarc.com consent.trustarc.com | Other | 121ms | 78 KB | — | €2/mo | Optional |
cdn.parsely.com cdn.parsely.com | Other | 101ms | 18 KB | — | €2/mo | Optional |
consent.trustarc.com consent.trustarc.com | Other | 91ms | 36 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 84ms | 173 KB | 38% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 80ms | 172 KB | 37% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 66ms | 173 KB | 39% | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 208ms and costs ~€4/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 208ms 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
80% of www.idc.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