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.
820 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.83 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
198 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.271
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.26 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.
3.68 s
Page Load Progression
375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 sFPage Weight BudgetAction3.1 MB transferred, 137 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
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 BundlesAction58 scripts, 583 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://consist.mta.info/search-icon/index.js | 183 KB | 132 KB (72%) | ✓ | 3rd |
| https://consist.mta.info/vuejs/apps/vendor/index.min.js | 158 KB | 98 KB (62%) | ✓ | 3rd |
| https://maps.googleapis.com/maps/api/js?key=AIzaSyApz95yUkEkciNmvj2ArI5QM9t1tScdpnA&libraries=places%2Cgeometry | 181 KB | 95 KB (53%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-RBMJZ3P3MQ | 177 KB | 69 KB (39%) | ✓ | 3rd |
| https://consist.mta.info/vuejs/apps/homepage/index.min.js | 73 KB | 58 KB (80%) | ✓ | 3rd |
| https://consist.mta.info/vuejs/apps/common/index.min.js | 56 KB | 31 KB (55%) | ✓ | 3rd |
| https://maps.googleapis.com/maps-api-v3/api/js/64/9c/common.js | 37 KB | 27 KB (74%) | ✓ | 3rd |
| https://maps.googleapis.com/maps-api-v3/api/js/64/9c/util.js | 70 KB | 27 KB (38%) | ✓ | 3rd |
| https://maps.googleapis.com/maps-api-v3/api/js/64/9c/controls.js | 26 KB | 24 KB (91%) | ✓ | 3rd |
| https://maps.googleapis.com/maps-api-v3/api/js/64/9c/map.js | 25 KB | 23 KB (90%) | ✓ | 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 InventoryAction137 resources · 3.1 MB · 583 KB savings availableFIX
~582.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 137 resources | 3.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction44 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
CJS Execution CostAction1475ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://consist.mta.info/vuejs/apps/homepage/index.min.js | 419ms | 361ms | 12ms | 3rd |
| https://www.mta.info/ | 404ms | 10ms | 6ms | 3rd |
| Unattributable | 330ms | 4ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-RBMJZ3P3MQ | 150ms | 114ms | 22ms | 3rd |
| https://consist.mta.info/search-icon/index.js | 90ms | 87ms | 1ms | 3rd |
| https://maps.googleapis.com/maps/api/js?key=AIzaSyApz95yUkEkciNmvj2ArI5QM9t1tScdpnA&libraries=places%2Cgeometry | 82ms | 49ms | 25ms | 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 Loading3 fonts (100 KB)PASS
Web fonts
3
100 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- 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 ~7 KB and ~14 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall137 requests over 2594msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
consist.mta.info consist.mta.info | Other | 419ms | 73 KB | 80% | $6/mo | Costly |
www.mta.info www.mta.info | Other | 404ms | 13 KB | — | $5/mo | Costly |
Unattributable Unattributable | Other | 330ms | 0 KB | — | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 150ms | 177 KB | 39% | $2/mo | Optional |
consist.mta.info consist.mta.info | Other | 90ms | 183 KB | 72% | $1/mo | Optional |
maps.googleapis.com maps.googleapis.com | Other | 82ms | 181 KB | 53% | $1/mo | Optional |
These scripts may cost more than they're worth
- consist.mta.info adds 419ms and costs ~$6/month
- www.mta.info adds 404ms and costs ~$5/month
- Unattributable adds 330ms 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
consist.mta.info takes 419ms 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 consist.mta.info'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
www.mta.info takes 404ms 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
Unattributable takes 330ms 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 consist.mta.info'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
53% of maps.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