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.
1.12 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.61 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
30 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.002
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.12 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.
3.17 s
Page Load Progression
464 ms
927 ms
1.4 s 1.9 s 2.3 s 2.8 s 3.2 s
3.7 sDThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction59 resources · 2.0 MB · 262 KB savings availableFIX
~261.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 59 resources | 2.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction2.0 MB transferred, 59 requestsREVIEW
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
BImage Optimization13 images, 0 KB saveableREVIEW
CJS BundlesAction25 scripts, 262 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.proquest.com/assets/stack/z46eac94d/en/os-std.js | 81 KB | 71 KB (88%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-F7FWH0G9HJ&cx=c>m=4e64h1 | 158 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.proquest.com/assets/stack/z9f60173b/en/core.js | 100 KB | 62 KB (62%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5NB2D7JC | 161 KB | 33 KB (20%) | ✓ | 3rd |
| https://www.proquest.com/assets/stack/z221a9c9/en/pqc.js | 34 KB | 30 KB (88%) | ✓ | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/extensions/mml2jax.js?V=2.7.7 | 2 KB | — | ✓ | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/extensions/MathZoom.js?V=2.7.7 | 3 KB | — | ✓ | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js | 17 KB | — | ✓ | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/jax/input/TeX/config.js?V=2.7.7 | 1 KB | — | ✓ | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/jax/input/MathML/config.js?V=2.7.7 | 1 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+JS Execution Cost499ms total JS executionPASS
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-5NB2D7JC | 149ms | 123ms | 18ms | 3rd |
| https://www.proquest.com/ | 130ms | 2ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-F7FWH0G9HJ&cx=c>m=4e64h1 | 80ms | 67ms | 13ms | 3rd |
| Unattributable | 76ms | 2ms | 0ms | 3rd |
| https://www.proquest.com/assets/stack/z9f60173b/en/core.js | 63ms | 51ms | 7ms | 3rd |
A+Font Loading4 fonts (290 KB)PASS
Web fonts
4
290 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
- 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
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 ~103 KB and ~206 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall59 requests over 1770msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 149ms | 161 KB | 20% | £2/mo | Optional |
www.proquest.com www.proquest.com | Other | 130ms | 14 KB | — | £2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 80ms | 158 KB | 42% | £1/mo | Optional |
Unattributable Unattributable | Other | 76ms | 0 KB | — | £1/mo | Optional |
www.proquest.com www.proquest.com | Other | 63ms | 100 KB | 62% | £1/mo | Optional |
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
62% of www.proquest.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