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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
51
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.01 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

4.65 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.

0.813

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.42 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.

4.65 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 s
Checks
15
6 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
5.7 MB transferred, 144 requests
FIX
5.7 MB transferred, 144 requests
Critical::
Page weighs 10.6 MB (5.7 MB transferred)
Warning::
Images are 3.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.3 MB
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
Fonts are 828 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 828 KB
Info::
CSS is 274 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 274 KB
Warning::
144 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.2 g CO2 per page load
5.7 MB / 2.4 MB budget
5.7 MB transferred
144 requests
1.2 g CO2 per page load
Images 3.3 MiB 57%
JavaScript 1.2 MiB 21%
Fonts 828.0 KiB 14%
CSS 274.5 KiB 5%
HTML 113.5 KiB 2%
Other 71.1 KiB 1%
Other 3.2 KiB 0%
Other 1.8 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

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.

Why this matters

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.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
88% third-party, 0 ms blocking
FIX
88% third-party, 0 ms blocking
Warning::
Third-party code accounts for 88% of page weight (5.1 MiB of 5.7 MiB)
Info::
Third-party blocking time is low (0 ms)
88%
First-party Third-party
D
Page Weight Inventory
Action
144 resources · 5.7 MB · 63 KB savings available
FIX
144 resources · 5.7 MB · 63 KB savings available
Warning::
Page weight 4.7 MB over 1MB target
Got: 5.7 MB Expected: ≤ 1 MB
Info::
~63 KB of savings available
Warning::
93 third-party resources (88% of weight)
Info::
6 resources over 200KB
144 resources · 5.7 MiB · 93 third-party 4.7 MiB over 1MB target
Image 57% · 3.3 MiB
JavaScript 21% · 1.2 MiB
Font 14% · 828.0 KiB
CSS 5% · 274.5 KiB
Document 2% · 114.6 KiB
Other 1% · 73.5 KiB

~63.5 KiB of savings available

Remove unused JavaScript: 63.5 KiB
C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://apogee.spacenews.com/assets/1b91b874-8dea-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://apogee.spacenews.com/assets/dcafc96d-160e-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://apogee.spacenews.com/assets/b2080f76-3372-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 3.3 MB
0 oversized -0 KB
5 legacy format
3 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
663ms total JS execution
REVIEW
663ms total JS execution
Warning::
https://spacenews.com/: 379ms CPU time
Info::
Unattributable: 162ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-Y8V6...: 70ms CPU time
Info::
https://c0.wp.com/c/6.9.4/wp-includes/js/jquery/jq...: 52ms CPU time
Info::
Third-party scripts: 284ms (43% of total)

Main Thread Breakdown

Style & Layout 31% Script Evaluation 26% Other 26% Rendering 6% Parse HTML & CSS 6% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://spacenews.com/379ms9ms5ms1st
Unattributable162ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Y8V618Z7WR70ms58ms12ms3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/jquery/jquery.min.js52ms12ms2ms3rd
B
JS Bundles
53 scripts, 63 KB unused
REVIEW
53 scripts, 63 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Y8V6...: 63 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 63 KB
63 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-Y8V618Z7WR157 KB63 KB (40%)✓3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/jquery/jquery.min.js31 KB—✓3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/jquery/jquery-migrate.min.js5 KB—✓3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/underscore.min.js8 KB—✓3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/wp-util.min.js1 KB—✓3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/hooks.min.js2 KB—✓3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/i18n.min.js3 KB—✓3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/vendor/wp-polyfill.min.js12 KB—✓3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/url.min.js4 KB—✓3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/dom-ready.min.js1 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
12 fonts (828 KB)
PASS
12 fonts (828 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

828 KB total

Render-blocking

0

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.0 s LCP 4.6 shttps://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/dFa5ZfeM_74wlPZtksIFYuUe6HOpW3pwfa0.woff2dFa5ZfeM_74wlPZtksIFYuU... https://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/dFa5ZfeM_74wlPZtksIFYuUe6HOpW3pwfa0.woff2 — 17.1 KiB — 164 ms — font-display: swaphttps://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/i7dOIFdwYjGaAMFtZd_QA1ZbYFeQGQyU.woff2i7dOIFdwYjGaAMFtZd_QA1Z... https://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/i7dOIFdwYjGaAMFtZd_QA1ZbYFeQGQyU.woff2 — 31.8 KiB — 355 ms — font-display: swaphttps://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/dFa5ZfeM_74wlPZtksIFYoEf6HOpW3pwfa0.woff2dFa5ZfeM_74wlPZtksIFYoE... https://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/dFa5ZfeM_74wlPZtksIFYoEf6HOpW3pwfa0.woff2 — 16.8 KiB — 304 ms — font-display: swaphttps://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/dFa4ZfeM_74wlPZtksIFaj8K_1SMdFJ6dQ.woff2dFa4ZfeM_74wlPZtksIFaj8... https://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/dFa4ZfeM_74wlPZtksIFaj8K_1SMdFJ6dQ.woff2 — 17.7 KiB — 158 ms — font-display: swaphttps://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/i7dMIFdwYjGaAMFtZd_QA1ZeUFWaHi6WZ3Q.woff2i7dMIFdwYjGaAMFtZd_QA1Z... https://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/i7dMIFdwYjGaAMFtZd_QA1ZeUFWaHi6WZ3Q.woff2 — 34.0 KiB — 150 ms — font-display: swaphttps://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/dFa5ZfeM_74wlPZtksIFYskZ6HOpW3pwfa0.woff2dFa5ZfeM_74wlPZtksIFYsk... https://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/dFa5ZfeM_74wlPZtksIFYskZ6HOpW3pwfa0.woff2 — 17.2 KiB — 142 ms — font-display: swaphttps://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/dFa6ZfeM_74wlPZtksIFajo6_V6LVlA.woff2dFa6ZfeM_74wlPZtksIFajo... https://spacenews.com/wp-content/cache/perfmatters/spacenews.com/fonts/dFa6ZfeM_74wlPZtksIFajo6_V6LVlA.woff2 — 17.1 KiB — 160 ms — font-display: swaphttps://spacenews.com/wp-content/plugins/newspack-plugin/dist/fonts/InterVariable.a0e477f2.woff2InterVariable.a0e477f2.... https://spacenews.com/wp-content/plugins/newspack-plugin/dist/fonts/InterVariable.a0e477f2.woff2 — 337.9 KiB — 405 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 107 ms — font-display: swaphttps://cdn2.niceboard.co/static-app/fonts/Inter/Inter-Bold.woff2Inter-Bold.woff2 https://cdn2.niceboard.co/static-app/fonts/Inter/Inter-Bold.woff2 — 104.0 KiB — 106 ms — font-display: swaphttps://cdn2.niceboard.co/static-app/fonts/Inter/Inter-Medium.woff2Inter-Medium.woff2 https://cdn2.niceboard.co/static-app/fonts/Inter/Inter-Medium.woff2 — 103.5 KiB — 109 ms — font-display: swaphttps://cdn2.niceboard.co/static-app/fonts/Inter/Inter-Regular.woff2Inter-Regular.woff2 https://cdn2.niceboard.co/static-app/fonts/Inter/Inter-Regular.woff2 — 97.1 KiB — 106 ms — font-display: swap
dFa5ZfeM_74wlPZtksIFYuU... woff2 swap
Size 17 KB
Load time 164 ms
Start 824 ms
Risk FOUT — text flashes from fallback to web font
i7dOIFdwYjGaAMFtZd_QA1Z... woff2 swap
Size 32 KB
Load time 355 ms
Start 824 ms
Risk FOUT — text flashes from fallback to web font
dFa5ZfeM_74wlPZtksIFYoE... woff2 swap
Size 17 KB
Load time 304 ms
Start 825 ms
Risk FOUT — text flashes from fallback to web font
dFa4ZfeM_74wlPZtksIFaj8... woff2 swap
Size 18 KB
Load time 158 ms
Start 828 ms
Risk FOUT — text flashes from fallback to web font
i7dMIFdwYjGaAMFtZd_QA1Z... woff2 swap
Size 34 KB
Load time 150 ms
Start 828 ms
Risk FOUT — text flashes from fallback to web font
dFa5ZfeM_74wlPZtksIFYsk... woff2 swap
Size 17 KB
Load time 142 ms
Start 829 ms
Risk FOUT — text flashes from fallback to web font
dFa6ZfeM_74wlPZtksIFajo... woff2 swap
Size 17 KB
Load time 160 ms
Start 829 ms
Risk FOUT — text flashes from fallback to web font
InterVariable.a0e477f2.... woff2 swap
Size 338 KB
Load time 405 ms
Start 903 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 107 ms
Start 985 ms
Risk FOUT — text flashes from fallback to web font
Inter-Bold.woff2 woff2 swap
Size 104 KB
Load time 106 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Inter-Medium.woff2 woff2 swap
Size 103 KB
Load time 109 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Inter-Regular.woff2 woff2 swap
Size 97 KB
Load time 106 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
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 ~273 KB and ~546 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
HTTP Caching
max-age=217 (3 minutes)
PASS
max-age=217 (3 minutes)
Info::
Cache-Control header is set
Got: max-age=217, must-revalidate
Info::
Effective TTL: 3 minutes (max-age=217)
Info::
Last-Modified header present
Cache-Control

max-age=217, must-revalidate

DirectiveValueMeaning
max-age217Cache for 3 minutes
must-revalidate—Must recheck with server after expiry
Effective TTL: 217 seconds
Network Waterfall
144 requests over 4225ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.0 s LCP 4.6 shttps://spacenews.com// https://spacenews.com/ — 200 — 52.8 KiB — 342 ms — h2https://i0.wp.com/spacenews.com/wp-content/uploads/2025/10/spacenews_logo-crop25.webp?w=736&ssl=1i0.wp.com/spacenews.com/wp-content/... https://i0.wp.com/spacenews.com/wp-content/uploads/2025/10/spacenews_logo-crop25.webp?w=736&ssl=1 — 200 — 7.5 KiB — 10 ms — h2https://i0.wp.com/spacenews.com/wp-content/uploads/2026/04/Screenshot-2026-04-22-at-3.41.05-PM.png?resize=800%2C600&ssl=1i0.wp.com/spacenews.com/wp-content/... https://i0.wp.com/spacenews.com/wp-content/uploads/2026/04/Screenshot-2026-04-22-at-3.41.05-PM.png?resize=800%2C600&ssl=1 — 200 — 121.5 KiB — 11 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/css/dist/block-library/style.min.cssc0.wp.com/c/6.9.4/wp-includes/css/d... https://c0.wp.com/c/6.9.4/wp-includes/css/dist/block-library/style.min.css — 200 — 16.1 KiB — 9 ms — h2https://spacenews.com/wp-content/plugins/newspack-blocks/dist/block_styles.css?ver=4.26.1/wp-content/plugins/newspack-blocks... https://spacenews.com/wp-content/plugins/newspack-blocks/dist/block_styles.css?ver=4.26.1 — 200 — 1.4 KiB — 131 ms — h2https://spacenews.com/wp-content/plugins/newspack-plugin/dist/newspack-ui.css?ver=6.37.0/wp-content/plugins/newspack-plugin... https://spacenews.com/wp-content/plugins/newspack-plugin/dist/newspack-ui.css?ver=6.37.0 — 200 — 12.0 KiB — 155 ms — h2https://spacenews.com/wp-content/plugins/newspack-newsletters/dist/subscriptions.css?ver=1776258121/wp-content/plugins/newspack-newsle... https://spacenews.com/wp-content/plugins/newspack-newsletters/dist/subscriptions.css?ver=1776258121 — 200 — 625 B — 131 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/css/dist/components/style.min.cssc0.wp.com/c/6.9.4/wp-includes/css/d... https://c0.wp.com/c/6.9.4/wp-includes/css/dist/components/style.min.css — 200 — 14.9 KiB — 11 ms — h2https://spacenews.com/wp-content/plugins/newspack-plugin/dist/commons.css?ver=6.37.0/wp-content/plugins/newspack-plugin... https://spacenews.com/wp-content/plugins/newspack-plugin/dist/commons.css?ver=6.37.0 — 200 — 20.4 KiB — 332 ms — h2https://spacenews.com/wp-content/plugins/newspack-plugin/dist/reader-auth.css?ver=6.37.0/wp-content/plugins/newspack-plugin... https://spacenews.com/wp-content/plugins/newspack-plugin/dist/reader-auth.css?ver=6.37.0 — 200 — 1.0 KiB — 134 ms — h2https://spacenews.com/wp-content/plugins/newspack-plugin/dist/other-scripts/recaptcha.css?ver=6.37.0/wp-content/plugins/newspack-plugin... https://spacenews.com/wp-content/plugins/newspack-plugin/dist/other-scripts/recaptcha.css?ver=6.37.0 — 200 — 686 B — 136 ms — h2https://spacenews.com/wp-content/plugins/newspack-plugin/dist/reader-registration-block.css?ver=6.37.0/wp-content/plugins/newspack-plugin... https://spacenews.com/wp-content/plugins/newspack-plugin/dist/reader-registration-block.css?ver=6.37.0 — 200 — 1.8 KiB — 131 ms — h2https://spacenews.com/wp-content/plugins/newspack-plugin/dist/other-scripts/corrections.css?ver=6.37.0/wp-content/plugins/newspack-plugin... https://spacenews.com/wp-content/plugins/newspack-plugin/dist/other-scripts/corrections.css?ver=6.37.0 — 200 — 562 B — 131 ms — h3https://spacenews.com/wp-content/plugins/newspack-plugin/dist/content-gate-block-patterns.css?ver=6.37.0/wp-content/plugins/newspack-plugin... https://spacenews.com/wp-content/plugins/newspack-plugin/dist/content-gate-block-patterns.css?ver=6.37.0 — 200 — 1.1 KiB — 124 ms — h3https://spacenews.com/wp-content/plugins/newspack-popups/dist/view.css?ver=1776098773/wp-content/plugins/newspack-popups... https://spacenews.com/wp-content/plugins/newspack-popups/dist/view.css?ver=1776098773 — 200 — 2.2 KiB — 138 ms — h3https://spacenews.com/wp-content/themes/newspack-scott/style.css?ver=2.21.0/wp-content/themes/newspack-scott/s... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
43% of JavaScript execution is third-party
First-party Third-party 284ms · 188KB · $2/mo
Unattributable
Other
Optional
Execution 162ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 70ms
Transfer 157 KB
Unused 40%
Monthly Cost $0/mo
c0.wp.com
Other
Optional
Execution 52ms
Transfer 31 KB
Monthly Cost $0/mo

43% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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