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.
4.92 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.66 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.11 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.31 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.
15.83 s
Page Load Progression
FPage Weight BudgetAction3.7 MB transferred, 144 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
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 CostAction5914ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://static.bonniernews.se/video-player/assets/js/main.min_1d01c7b4f9e2fcca6d8679dd54e11e8a.js | 2360ms | 1881ms | 81ms | 3rd |
| Unattributable | 1540ms | 153ms | 0ms | 3rd |
| https://www.expressen.se/ | 780ms | 60ms | 7ms | 3rd |
| https://micro.rubiconproject.com/prebid/dynamic/12954.js | 236ms | 176ms | 59ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 209ms | 114ms | 48ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 207ms | 177ms | 29ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/ui-web-sv-web.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 206ms | 86ms | 24ms | 3rd |
| https://tracking.expressen.se/gtm.js?id=GTM-MQ5CW3S&l=dl1756283352564 | 150ms | 107ms | 42ms | 3rd |
| https://imasdk.googleapis.com/js/sdkloader/ima3.js | 98ms | 63ms | 34ms | 3rd |
| https://securepubads.g.doubleclick.net/tag/js/gpt.js | 72ms | 65ms | 7ms | 3rd |
Showing top 10 of 11 scripts
FJS BundlesAction53 scripts, 641 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://static.bonniernews.se/video-player/assets/js/main.min_1d01c7b4f9e2fcca6d8679dd54e11e8a.js | 289 KB | 177 KB (61%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 143 KB (76%) | ✓ | 3rd |
| https://imasdk.googleapis.com/js/sdkloader/ima3.js | 146 KB | 110 KB (76%) | ✓ | 3rd |
| https://micro.rubiconproject.com/prebid/dynamic/12954.js | 149 KB | 83 KB (56%) | ✓ | 3rd |
| https://tracking.expressen.se/gtm.js?id=GTM-MQ5CW3S&l=dl1756283352564 | 127 KB | 62 KB (49%) | ✓ | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 102 KB | 44 KB (44%) | ✓ | 3rd |
| https://assets.bonad.io/bundles/bad.js | 25 KB | 22 KB (87%) | ✓ | 3rd |
| blob:https://www.expressen.se/7030d77e-1638-4851-a31c-28a60d915438 | -0 KB | — | ✓ | 3rd |
| blob:https://www.expressen.se/7eff01bf-8a3f-468f-b439-ba94958dad39 | -0 KB | — | ✓ | 3rd |
| https://static.bonniernews.se/bundles/expressen/scripts/main.mobile_aecba15f79d96763ab78a910949cb16a.js | 22 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
FPage Weight InventoryAction144 resources · 3.7 MB · 641 KB savings availableFIX
~640.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 144 resources | 3.7 MiB | ||||||
BImage Optimization43 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (96 KB)PASS
Web fonts
4
96 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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 ~2 KB and ~4 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints4 hints, 0 missing preconnectsPASS
Current Resource Hints
4 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Google Cloud
AHTTP Cachingmax-age=10 (10 seconds)PASS
max-age=10
| Directive | Value | Meaning |
|---|---|---|
| max-age | 10 | Cache for 10 seconds |
Network Waterfall144 requests over 2401msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
static.bonniernews.se static.bonniernews.se | Other | 2360ms | 289 KB | 61% | kr142/mo | Costly |
Unattributable Unattributable | Other | 1540ms | 0 KB | — | kr93/mo | Costly |
www.expressen.se www.expressen.se | Other | 780ms | 94 KB | — | kr47/mo | Costly |
micro.rubiconproject.com micro.rubiconproject.com | Other | 236ms | 149 KB | 56% | kr14/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 209ms | 188 KB | 76% | kr13/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 207ms | 102 KB | 44% | kr12/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 206ms | 53 KB | — | kr12/mo | Costly |
tracking.expressen.se tracking.expressen.se | Other | 150ms | 127 KB | 49% | kr9/mo | Optional |
imasdk.googleapis.com imasdk.googleapis.com | Other | 98ms | 146 KB | 76% | kr6/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 72ms | 34 KB | — | kr4/mo | Optional |
static.bonniernews.se static.bonniernews.se | Other | 57ms | 22 KB | — | kr3/mo | Optional |
These scripts may cost more than they're worth
- static.bonniernews.se adds 2360ms and costs ~kr142/month
- Unattributable adds 1540ms and costs ~kr93/month
- www.expressen.se adds 780ms and costs ~kr47/month
- micro.rubiconproject.com adds 236ms and costs ~kr14/month
- securepubads.g.doubleclick.net adds 209ms and costs ~kr13/month
- sdk.privacy-center.org adds 207ms and costs ~kr12/month
- sdk.privacy-center.org adds 206ms and costs ~kr12/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
static.bonniernews.se takes 2360ms 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 static.bonniernews.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
Unattributable takes 1540ms 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.expressen.se takes 780ms 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
micro.rubiconproject.com takes 236ms 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
56% of micro.rubiconproject.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
securepubads.g.doubleclick.net takes 209ms 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
76% of securepubads.g.doubleclick.net'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
sdk.privacy-center.org takes 207ms 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
sdk.privacy-center.org takes 206ms 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
76% of imasdk.googleapis.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