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.
721 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.05 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.082
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.10 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.
1.06 s
Page Load Progression
DHTTP CachingActionno-store (uncacheable)FIX
private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
| max-age | 0 | Cache for 0 seconds |
| no-store | — | Never cache this response |
| no-cache | — | Cache but always revalidate first |
| must-revalidate | — | Must recheck with server after expiry |
| post-check | 0 | |
| pre-check | 0 |
BPage Weight Budget1.2 MB transferred, 47 requestsREVIEW
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
BImage Optimization11 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
BJS Execution Cost642ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://publicationethics.org/ | 186ms | 11ms | 1ms | 1st |
| https://publicationethics.org/themes/custom/rutherford/libraries/alpinejs/dist/cdn.min.js?tbqj5o | 160ms | 33ms | 1ms | 1st |
| Unattributable | 100ms | 4ms | 0ms | 3rd |
| https://publicationethics.org/sites/default/files/js/js_600qmvfdKx7GqWIP3F0xCmtJItLQOsvkYfFafAMx960.js?scope=footer&delta=0&language=en&theme=rutherford&include=eJx1kGuuAyEIhTc0dpbUMJU69CIYxGa6-9qb_tBJmhjM-SA8TgQHhhfauuEOT1KrizXf0e5qcU2sG_CChzPJ3xqtFeDLVy5JNTFeHdKaPM8S0llf4AHH2LwWI8eRPFouwbW_MuIeckDGjOITpyMYSNRMFWP4L6M4HVAgYah4c1IZ-dbcZ3IDi5NW8T4vMFUnSadSbRV5ZP3XsCNEtBE3JyZ_BeneJjhv0Q3IYL-yGWv9rL-ByNy1dt--w954F7A3 | 93ms | 58ms | 4ms | 1st |
| https://publicationethics.org/cdn-cgi/challenge-platform/scripts/jsd/main.js | 53ms | 46ms | 1ms | 1st |
| https://publicationethics.org/sites/default/files/js/js_qmM8q6AlAsLObm33ZB9_7ohm2zG-zcp6F-Stm-9XnJo.js?scope=footer&delta=2&language=en&theme=rutherford&include=eJx1kGuuAyEIhTc0dpbUMJU69CIYxGa6-9qb_tBJmhjM-SA8TgQHhhfauuEOT1KrizXf0e5qcU2sG_CChzPJ3xqtFeDLVy5JNTFeHdKaPM8S0llf4AHH2LwWI8eRPFouwbW_MuIeckDGjOITpyMYSNRMFWP4L6M4HVAgYah4c1IZ-dbcZ3IDi5NW8T4vMFUnSadSbRV5ZP3XsCNEtBE3JyZ_BeneJjhv0Q3IYL-yGWv9rL-ByNy1dt--w954F7A3 | 51ms | 21ms | 4ms | 1st |
BJS Bundles15 scripts, 133 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-NDJJQK2 | 128 KB | 62 KB (49%) | ✓ | 3rd |
| https://publicationethics.org/sites/default/files/js/js_jD4rXUDxNEIZX7uWakLsLaSkUR3qGUHBExDfHqlmkzA.js?scope=footer&delta=8&language=en&theme=rutherford&include=eJx1kGuuAyEIhTc0dpbUMJU69CIYxGa6-9qb_tBJmhjM-SA8TgQHhhfauuEOT1KrizXf0e5qcU2sG_CChzPJ3xqtFeDLVy5JNTFeHdKaPM8S0llf4AHH2LwWI8eRPFouwbW_MuIeckDGjOITpyMYSNRMFWP4L6M4HVAgYah4c1IZ-dbcZ3IDi5NW8T4vMFUnSadSbRV5ZP3XsCNEtBE3JyZ_BeneJjhv0Q3IYL-yGWv9rL-ByNy1dt--w954F7A3 | 69 KB | 37 KB (53%) | ✓ | 1st |
| https://publicationethics.org/sites/default/files/js/js_qmM8q6AlAsLObm33ZB9_7ohm2zG-zcp6F-Stm-9XnJo.js?scope=footer&delta=2&language=en&theme=rutherford&include=eJx1kGuuAyEIhTc0dpbUMJU69CIYxGa6-9qb_tBJmhjM-SA8TgQHhhfauuEOT1KrizXf0e5qcU2sG_CChzPJ3xqtFeDLVy5JNTFeHdKaPM8S0llf4AHH2LwWI8eRPFouwbW_MuIeckDGjOITpyMYSNRMFWP4L6M4HVAgYah4c1IZ-dbcZ3IDi5NW8T4vMFUnSadSbRV5ZP3XsCNEtBE3JyZ_BeneJjhv0Q3IYL-yGWv9rL-ByNy1dt--w954F7A3 | 57 KB | 34 KB (60%) | ✓ | 1st |
| https://publicationethics.org/sites/default/files/js/js_MFgW-CCkI51uXTBFlzkXT5_sL-hNhetIc0EzRF2Ah0Y.js?scope=footer&delta=6&language=en&theme=rutherford&include=eJx1kGuuAyEIhTc0dpbUMJU69CIYxGa6-9qb_tBJmhjM-SA8TgQHhhfauuEOT1KrizXf0e5qcU2sG_CChzPJ3xqtFeDLVy5JNTFeHdKaPM8S0llf4AHH2LwWI8eRPFouwbW_MuIeckDGjOITpyMYSNRMFWP4L6M4HVAgYah4c1IZ-dbcZ3IDi5NW8T4vMFUnSadSbRV5ZP3XsCNEtBE3JyZ_BeneJjhv0Q3IYL-yGWv9rL-ByNy1dt--w954F7A3 | 13 KB | — | ✓ | 1st |
| https://publicationethics.org/sites/default/files/js/js_600qmvfdKx7GqWIP3F0xCmtJItLQOsvkYfFafAMx960.js?scope=footer&delta=0&language=en&theme=rutherford&include=eJx1kGuuAyEIhTc0dpbUMJU69CIYxGa6-9qb_tBJmhjM-SA8TgQHhhfauuEOT1KrizXf0e5qcU2sG_CChzPJ3xqtFeDLVy5JNTFeHdKaPM8S0llf4AHH2LwWI8eRPFouwbW_MuIeckDGjOITpyMYSNRMFWP4L6M4HVAgYah4c1IZ-dbcZ3IDi5NW8T4vMFUnSadSbRV5ZP3XsCNEtBE3JyZ_BeneJjhv0Q3IYL-yGWv9rL-ByNy1dt--w954F7A3 | 37 KB | — | ✓ | 1st |
| https://publicationethics.org/sites/default/files/js/js_BryevAfIeDQ1pCFSrVGihhq-6PCngIpMcwMXLjj_C8o.js?scope=footer&delta=4&language=en&theme=rutherford&include=eJx1kGuuAyEIhTc0dpbUMJU69CIYxGa6-9qb_tBJmhjM-SA8TgQHhhfauuEOT1KrizXf0e5qcU2sG_CChzPJ3xqtFeDLVy5JNTFeHdKaPM8S0llf4AHH2LwWI8eRPFouwbW_MuIeckDGjOITpyMYSNRMFWP4L6M4HVAgYah4c1IZ-dbcZ3IDi5NW8T4vMFUnSadSbRV5ZP3XsCNEtBE3JyZ_BeneJjhv0Q3IYL-yGWv9rL-ByNy1dt--w954F7A3 | 2 KB | — | ✓ | 1st |
| https://publicationethics.org/sites/default/files/js/js_P0wxIANHlPnO8h-yZyy2udlablWf2sW_OdR_iQKobwk.js?scope=header&delta=1&language=en&theme=rutherford&include=eJx1kGuuAyEIhTc0dpbUMJU69CIYxGa6-9qb_tBJmhjM-SA8TgQHhhfauuEOT1KrizXf0e5qcU2sG_CChzPJ3xqtFeDLVy5JNTFeHdKaPM8S0llf4AHH2LwWI8eRPFouwbW_MuIeckDGjOITpyMYSNRMFWP4L6M4HVAgYah4c1IZ-dbcZ3IDi5NW8T4vMFUnSadSbRV5ZP3XsCNEtBE3JyZ_BeneJjhv0Q3IYL-yGWv9rL-ByNy1dt--w954F7A3 | 0 KB | — | ✓ | 1st |
| https://publicationethics.org/modules/contrib/google_tag/js/gtag.js?tbqj5o | 1 KB | — | ✓ | 1st |
| https://publicationethics.org/themes/custom/rutherford/libraries/lazysizes/lazysizes.min.js?tbqj5o | 4 KB | — | ✓ | 1st |
| https://publicationethics.org/themes/custom/rutherford/libraries/alpinejs/dist/cdn.min.js?tbqj5o | 18 KB | — | ✓ | 1st |
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
BPage Weight Inventory47 resources · 1.2 MB · 133 KB savings availableREVIEW
~133.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 47 resources | 1.2 MiB | ||||||
A+Third-Party Impact13% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (429 KB)PASS
Web fonts
7
429 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 ~182 KB and ~364 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: Cloudflare
Network Waterfall47 requests over 1175msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 100ms | 0 KB | — | $1/mo | Optional |