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.
989 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.66 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
544 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.97 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.
3.52 s
Page Load Progression
DPage Weight BudgetAction2.4 MB transferred, 142 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
DJS Execution CostAction2608ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.flysas.com/_next/static/chunks/88239-b8631d9a9fa62b4f.js | 1152ms | 1053ms | 15ms | 3rd |
| https://www.flysas.com/en | 335ms | 50ms | 34ms | 3rd |
| https://www.flysas.com/_next/static/chunks/8b09b07f-beaecbbcfaa03979.js | 234ms | 218ms | 5ms | 3rd |
| Unattributable | 233ms | 5ms | 0ms | 3rd |
| https://gtm.flysas.com/gtm.js?id=GTM-55CPTWDT&l=sasD360DataLayer | 148ms | 128ms | 17ms | 3rd |
| https://www.flysas.com/_next/static/chunks/77441-fea09ec22bef10fc.js | 114ms | 102ms | 12ms | 3rd |
| https://www.flysas.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 114ms | 108ms | 2ms | 3rd |
| https://surveys-static-prd.survicate-cdn.com/widget_core-28.23.6.js | 110ms | 90ms | 16ms | 3rd |
| https://gtm.flysas.com/gtag/js?id=G-4BBTM6PGF2&l=sasD360DataLayer&cx=c>m=4e64e0&sign=80984f5caf0ab6495c34401bd5cb7bff92d63851accb9ba65e456e75d5703456_20260415&bs=ctrl | 96ms | 82ms | 12ms | 3rd |
| https://www.flysas.com/_next/static/chunks/30564-7ee2ce6f68393284.js | 73ms | 71ms | 2ms | 3rd |
FJS BundlesAction48 scripts, 928 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.flysas.com/_next/static/chunks/77441-fea09ec22bef10fc.js | 313 KB | 304 KB (97%) | ✓ | 3rd |
| https://www.flysas.com/_next/static/chunks/94529-a2eda038cc853556.js | 111 KB | 88 KB (80%) | ✓ | 3rd |
| https://surveys-static-prd.survicate-cdn.com/widget_core-28.23.6.js | 161 KB | 77 KB (48%) | ✓ | 3rd |
| https://www.flysas.com/_next/static/chunks/88239-b8631d9a9fa62b4f.js | 118 KB | 74 KB (62%) | ✓ | 3rd |
| https://gtm.flysas.com/gtag/js?id=G-4BBTM6PGF2&l=sasD360DataLayer&cx=c>m=4e64e0&sign=80984f5caf0ab6495c34401bd5cb7bff92d63851accb9ba65e456e75d5703456_20260415&bs=ctrl | 161 KB | 65 KB (40%) | ✓ | 3rd |
| https://www.flysas.com/_next/static/chunks/6021dd38-0c60914a247bec83.js | 63 KB | 63 KB (100%) | ✓ | 3rd |
| https://www.flysas.com/_next/static/chunks/45901-96f8baef58351eb7.js | 66 KB | 54 KB (87%) | ✓ | 3rd |
| https://gtm.flysas.com/gtm.js?id=GTM-55CPTWDT&l=sasD360DataLayer | 152 KB | 52 KB (34%) | ✓ | 3rd |
| https://www.flysas.com/_next/static/chunks/48145-691418ac9bf2731d.js | 91 KB | 49 KB (55%) | ✓ | 3rd |
| https://www.flysas.com/_next/static/chunks/9404abb8-d7240e7adc437fd7.js | 37 KB | 35 KB (94%) | ✓ | 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 InventoryAction142 resources · 2.4 MB · 928 KB savings availableFIX
~927.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 142 resources | 2.4 MiB | ||||||
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization15 images, 0 KB saveablePASS
A+Font Loading2 fonts (45 KB)PASS
Web fonts
2
45 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
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)
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
AHTTP Cachingmax-age=3600 (1 hour)PASS
max-age=3600
| Directive | Value | Meaning |
|---|---|---|
| max-age | 3600 | Cache for 1 hour |
Network Waterfall142 requests over 4247msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.flysas.com www.flysas.com | Other | 1152ms | 118 KB | 62% | $15/mo | Costly |
www.flysas.com www.flysas.com | Other | 335ms | 120 KB | — | $4/mo | Costly |
www.flysas.com www.flysas.com | Other | 234ms | 54 KB | — | $3/mo | Costly |
Unattributable Unattributable | Other | 233ms | 0 KB | — | $3/mo | Costly |
gtm.flysas.com gtm.flysas.com | Other | 148ms | 152 KB | 34% | $2/mo | Optional |
www.flysas.com www.flysas.com | Other | 114ms | 313 KB | 97% | $2/mo | Optional |
www.flysas.com www.flysas.com | Other | 114ms | 0 KB | — | $2/mo | Optional |
surveys-static-prd.survicate-cdn.com surveys-static-prd.survicate-cdn.com | Other | 110ms | 161 KB | 48% | $1/mo | Optional |
gtm.flysas.com gtm.flysas.com | Other | 96ms | 161 KB | 40% | $1/mo | Optional |
www.flysas.com www.flysas.com | Other | 73ms | 22 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.flysas.com adds 1152ms and costs ~$15/month
- www.flysas.com adds 335ms and costs ~$4/month
- www.flysas.com adds 234ms and costs ~$3/month
- Unattributable adds 233ms and costs ~$3/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.flysas.com takes 1152ms 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
62% of www.flysas.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
www.flysas.com takes 335ms 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.flysas.com takes 234ms 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 233ms 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
97% of www.flysas.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