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.
844 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.66 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
130 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.104
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.55 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.
3.70 s
Page Load Progression
FPage Weight BudgetAction23.5 MB transferred, 100 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
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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2018ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.su.se/ | 607ms | 25ms | 12ms | 3rd |
| https://mfstatic.com/js/mediaflowplayer.min.js | 537ms | 311ms | 127ms | 3rd |
| Unattributable | 338ms | 12ms | 0ms | 3rd |
| https://www.su.se/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91323565c321a3e9eae94fac0e4faeb5977ea/webapps/webapp_sdk-legacy.js | 242ms | 161ms | 1ms | 3rd |
| https://cdn.matomo.cloud/su.matomo.cloud/container_Pt55LtXh.js | 123ms | 77ms | 28ms | 3rd |
| https://www.su.se/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91323565c321a3e9eae94fac0e4faeb5977ea/js/webAppExternals/react_18_3.js | 121ms | 56ms | 14ms | 3rd |
| https://www.su.se/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91323565c321a3e9eae94fac0e4faeb5977ea/js/portlets.js | 51ms | 37ms | 14ms | 3rd |
DPage Weight InventoryAction100 resources · 23.5 MB · 216 KB savings availableFIX
~216.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 100 resources | 23.5 MiB | ||||||
BImage Optimization38 images, 0 KB saveableREVIEW
CJS BundlesAction22 scripts, 216 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://mfstatic.com/js/mediaflowplayer.min.js | 232 KB | 166 KB (72%) | ✓ | 3rd |
| https://www.su.se/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91323565c321a3e9eae94fac0e4faeb5977ea/js/portlets.js | 39 KB | 27 KB (70%) | ✓ | 3rd |
| https://cdn.matomo.cloud/su.matomo.cloud/container_Pt55LtXh.js | 82 KB | 24 KB (29%) | ✓ | 3rd |
| https://www.su.se/download/18.1c7635ca19b2be312be5aa/1766047954093/su-cookie-banner.js | 1 KB | — | ✓ | 3rd |
| https://www.su.se/webapp-resource/2.5a231a8f188bd840a134521/360.1a81f8119d24bd97d4134c/1775059329495/webapp-assets.js | 34 KB | — | ✓ | 3rd |
| https://www.su.se/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91323565c321a3e9eae94fac0e4faeb5977ea/js/jquery.js | 31 KB | — | ✓ | 3rd |
| https://www.su.se/download/18.4347052c19c47d1ff8034a/1772023148506/su-caption-resizer.js | 1 KB | — | ✓ | 3rd |
| https://analytics.silktide.com/74b131141f81660adb30681e6579d5b4.js | 16 KB | — | ✓ | 3rd |
| https://www.su.se/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91323565c321a3e9eae94fac0e4faeb5977ea/js/webAppExternals/react_18_3.js | 39 KB | — | ✓ | 3rd |
| https://www.su.se/webapp-resource/2.5a231a8f188bd840a134521/360.5b01cb38199c925a316d01/1760364859845/webapp-assets.js | 2 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (892 KB)PASS
Web fonts
7
892 KB total
Render-blocking
0
of 7
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
- 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 ~350 KB and ~700 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Sitevision AB
AHTTP Cachingmax-age=31536000 (52 weeks)PASS
public, max-age=31536000, immutable
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 31536000 | Cache for 52 weeks |
| immutable | — | Content will never change |
Network Waterfall100 requests over 2664msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.su.se www.su.se | Other | 607ms | 23 KB | — | kr66/mo | Costly |
mfstatic.com mfstatic.com | Other | 537ms | 232 KB | 72% | kr58/mo | Costly |
Unattributable Unattributable | Other | 338ms | 0 KB | — | kr37/mo | Costly |
www.su.se www.su.se | Other | 242ms | 9 KB | — | kr26/mo | Costly |
Matomo cdn.matomo.cloud | Analytics | 123ms | 82 KB | 29% | kr13/mo | Optional |
www.su.se www.su.se | Other | 121ms | 39 KB | — | kr13/mo | Optional |
www.su.se www.su.se | Other | 51ms | 39 KB | 70% | kr6/mo | Optional |
These scripts may cost more than they're worth
- www.su.se adds 607ms and costs ~kr66/month
- mfstatic.com adds 537ms and costs ~kr58/month
- Unattributable adds 338ms and costs ~kr37/month
- www.su.se adds 242ms and costs ~kr26/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
www.su.se takes 607ms 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
mfstatic.com takes 537ms 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
72% of mfstatic.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
Unattributable takes 338ms 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.su.se takes 242ms 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
70% of www.su.se'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