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.
3.13 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.13 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
297 ms
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.
3.13 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.
11.99 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2616ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://sourceforge.net/ | 770ms | 98ms | 16ms | 3rd |
| Unattributable | 688ms | 125ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-1H226E4E4L&cx=c>m=4e64h1 | 377ms | 277ms | 64ms | 3rd |
| https://a.fsdn.com/con/js/min/sf.sandiego-head.js?1776799858 | 222ms | 143ms | 18ms | 3rd |
| https://analytics.slashdotmedia.com/sf.js | 107ms | 86ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtag/js | 105ms | 73ms | 30ms | 3rd |
| https://j.6sc.co/6si.min.js | 96ms | 75ms | 10ms | 3rd |
| https://a.fsdn.com/con/js/min/sf.sandiego-project.js?1776799858 | 78ms | 37ms | 17ms | 3rd |
| https://a.fsdn.com/con/js/min/sf.sandiego-base.js?1776799858 | 64ms | 31ms | 19ms | 3rd |
| https://a.fsdn.com/con/js/min/sf.sandiego-foundation-base.js?1776799858 | 55ms | 38ms | 11ms | 3rd |
Showing top 10 of 11 scripts
DPage Weight InventoryAction87 resources · 1.6 MB · 171 KB savings availableFIX
~171.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 87 resources | 1.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.6 MB transferred, 87 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
CImage OptimizationAction30 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
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
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 BundlesAction25 scripts, 171 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-1H226E4E4L&cx=c>m=4e64h1 | 161 KB | 64 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js | 85 KB | 51 KB (60%) | ✓ | 3rd |
| https://a.fsdn.com/con/js/min/sf.sandiego-project.js?1776799858 | 42 KB | 29 KB (68%) | ✓ | 3rd |
| https://a.fsdn.com/con/js/min/sf.sandiego-base.js?1776799858 | 41 KB | 27 KB (67%) | ✓ | 3rd |
| https://a.fsdn.com/con/js/min/sf.sandiego-foundation-base.js?1776799858 | 18 KB | — | ✓ | 3rd |
| https://pagead2.googlesyndication.com/pagead/js/pcd.js?8901705213 | 17 KB | — | ✓ | 3rd |
| https://a.fsdn.com/con/js/min/sf.sandiego-cmp-top.js?1776799858 | 0 KB | — | ✓ | 3rd |
| https://a.fsdn.com/con/js/asg_embed.js?1776799858 | 0 KB | — | ✓ | 3rd |
| https://a.fsdn.com/con/js/min/sf.sandiego-project-disallow.js?1776799858 | 0 KB | — | ✓ | 3rd |
| https://j.6sc.co/j/58729049-be80-466a-9abf-b3911430bbd8.js | 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (34 KB)PASS
Web fonts
3
34 KB total
Render-blocking
0
of 3
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+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: Cloudflare
Network Waterfall87 requests over 5232msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
sourceforge.net sourceforge.net | Other | 770ms | 31 KB | — | $10/mo | Costly |
Unattributable Unattributable | Other | 688ms | 0 KB | — | $9/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 377ms | 161 KB | 40% | $5/mo | Costly |
a.fsdn.com a.fsdn.com | Other | 222ms | 0 KB | — | $3/mo | Costly |
analytics.slashdotmedia.com analytics.slashdotmedia.com | Other | 107ms | 23 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 105ms | 85 KB | 60% | $1/mo | Optional |
j.6sc.co j.6sc.co | Other | 96ms | 19 KB | — | $1/mo | Optional |
a.fsdn.com a.fsdn.com | Other | 78ms | 42 KB | 68% | $1/mo | Optional |
a.fsdn.com a.fsdn.com | Other | 64ms | 41 KB | 67% | $1/mo | Optional |
a.fsdn.com a.fsdn.com | Other | 55ms | 18 KB | — | $1/mo | Optional |
ads.pro-market.net ads.pro-market.net | Other | 53ms | 2 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- sourceforge.net adds 770ms and costs ~$10/month
- Unattributable adds 688ms and costs ~$9/month
- Google Tag Manager adds 377ms and costs ~$5/month
- a.fsdn.com adds 222ms 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
sourceforge.net takes 770ms 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 688ms 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
Google Tag Manager takes 377ms 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
a.fsdn.com takes 222ms 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
60% of Google Tag Manager'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
68% of a.fsdn.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
67% of a.fsdn.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