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https://wunderground.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
3
REVIEW
5
PASS
5
INFO
2

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

Mobile Desktop
80
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

1.20 s

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

2.25 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

29 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.093

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

1.95 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.

2.25 s

Page Load Progression

485 ms
970 ms
1.5 s
1.9 s
2.4 s
2.9 s
3.4 s
3.9 s
Checks
15
5 PASS 5 REVIEW 3 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.0 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
42 scripts, 560 KB unused
FIX
42 scripts, 560 KB unused
Warning::
https://cdn.taboola.com/libtrc/theweatherchannel-w...: 230 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.wunderground.com/bundle-next/chunk-KYH...: 150 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.w-x.co/helios/twc/1.80.4/helios.js: 73 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.wunderground.com/api/v1/script/dprSdkS...: 33 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.wunderground.com/bundle-next/chunk-4LC...: 29 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 560 KB
560 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.taboola.com/libtrc/theweatherchannel-wunderground/loader.js319 KB230 KB (72%)✓3rd
https://www.wunderground.com/bundle-next/chunk-KYHM4T5F.js272 KB150 KB (55%)✓3rd
https://s.w-x.co/helios/twc/1.80.4/helios.js89 KB73 KB (82%)✓3rd
https://www.wunderground.com/api/v1/script/dprSdkScript.js67 KB33 KB (50%)✓3rd
https://www.wunderground.com/bundle-next/chunk-4LC4HDOP.js50 KB29 KB (58%)✓3rd
https://www.wunderground.com/api/v1/script/upsxSdkScript.js38 KB25 KB (67%)✓3rd
https://www.wunderground.com/api/v1/script/moduleServiceScript.js31 KB21 KB (70%)✓3rd
https://www.wunderground.com/bundle-next/chunk-OUUKEUHO.js3 KB—✓3rd
https://www.wunderground.com/bundle-next/chunk-2W5VPVZE.js17 KB—✓3rd
https://www.wunderground.com/bundle-next/polyfills-FFHMD2TL.js13 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

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

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

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

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

F
Page Weight Inventory
Action
96 resources · 2.0 MB · 560 KB savings available
FIX
96 resources · 2.0 MB · 560 KB savings available
Warning::
Page weight 1020 KB over 1MB target
Got: 2.0 MB Expected: ≤ 1 MB
Info::
~560 KB of savings available
Warning::
95 third-party resources (100% of weight)
Info::
2 resources over 200KB
96 resources · 2.0 MiB · 95 third-party 1020.1 KiB over 1MB target
JavaScript 67% · 1.3 MiB
Image 16% · 324.5 KiB
Font 10% · 210.9 KiB
Document 3% · 57.5 KiB
CSS 3% · 51.7 KiB
Other 2% · 37.9 KiB

~560.1 KiB of savings available

Remove unused JavaScript: 560.1 KiB
C
Page Weight Budget
Action
2.0 MB transferred, 96 requests
REVIEW
2.0 MB transferred, 96 requests
Info::
Page weighs 6.3 MB (2.0 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
Fonts are 211 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 211 KB
Info::
96 HTTP requests
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
96 requests
0.42 g CO2 per page load
JavaScript 1.3 MiB 67%
Images 320.7 KiB 16%
Fonts 210.9 KiB 10%
HTML 56.3 KiB 3%
CSS 51.7 KiB 3%
Other 34.0 KiB 2%
Other 4.9 KiB 0%
Other 4.5 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://www.wunderground.com/static/i/c/v4/12.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.w-x.co/severe-21apr26.png?crop=16:9&widt... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.wunderground.com/static/i/misc/twc-whi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.wunderground.com/static/i/misc/twc-kno... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.wunderground.com/static/i/c/v4/26.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.wunderground.com/static/i/c/v4/27.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.wunderground.com/static/i/misc/wu-knoc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.wunderground.com/static/i/misc/sr-knoc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.wunderground.com/static/i/c/v4/30.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.w-x.co/WindPollen_1.jpg?crop=16:9&width=... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.wunderground.com/static/i/c/v4/11.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.w-x.co/WildfiresNightStudy_3.jpg?crop=16... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 321 KB
0 oversized -0 KB
19 legacy format
13 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

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

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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

C
JS Execution Cost
Action
1223ms total JS execution
REVIEW
1223ms total JS execution
Warning::
https://www.wunderground.com/: 442ms CPU time
Info::
Unattributable: 212ms CPU time
Info::
https://www.wunderground.com/bundle-next/polyfills...: 170ms CPU time
Info::
https://www.wunderground.com/assets/js/new-relic/n...: 116ms CPU time
Info::
https://cdn.taboola.com/libtrc/theweatherchannel-w...: 81ms CPU time
Warning::
Third-party scripts: 1223ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 23% Style & Layout 13% Rendering 10% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.wunderground.com/442ms2ms1ms3rd
Unattributable212ms26ms0ms3rd
https://www.wunderground.com/bundle-next/polyfills-FFHMD2TL.js170ms138ms0ms3rd
https://www.wunderground.com/assets/js/new-relic/new-relic.prod.ext.js116ms77ms11ms3rd
https://cdn.taboola.com/libtrc/theweatherchannel-wunderground/loader.js81ms44ms36ms3rd
https://www.wunderground.com/bundle-next/chunk-WPW6PZDG.js78ms76ms0ms3rd
https://www.wunderground.com/bundle-next/chunk-KYHM4T5F.js65ms49ms1ms3rd
https://js-agent.newrelic.com/nr-spa-1.284.1.min.js60ms52ms4ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0, no-cache
REVIEW
max-age=0, no-cache
Info::
Cache-Control header is set
Got: max-age=0, no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-cache

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
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
4 fonts (211 KB)
PASS
4 fonts (211 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

211 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 2.2 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 42.2 KiB — 54 ms — font-display: swaphttps://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2flUhRq6tzZclQEJ-Vdg-Iui... https://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2 — 125.4 KiB — 72 ms — font-display: swaphttps://www.wunderground.com/bundle-next/media/IBMPlexSans-SemiBold-Latin1-K4ZXQL53.woff2IBMPlexSans-SemiBold-La... https://www.wunderground.com/bundle-next/media/IBMPlexSans-SemiBold-Latin1-K4ZXQL53.woff2 — 22.3 KiB — 208 ms — font-display: swaphttps://www.wunderground.com/bundle-next/media/IBMPlexSans-Regular-Latin1-YRFYPNCY.woff2IBMPlexSans-Regular-Lat... https://www.wunderground.com/bundle-next/media/IBMPlexSans-Regular-Latin1-YRFYPNCY.woff2 — 21.0 KiB — 194 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 42 KB
Load time 54 ms
Start 407 ms
Risk FOUT — text flashes from fallback to web font
flUhRq6tzZclQEJ-Vdg-Iui... woff2 swap
Size 125 KB
Load time 72 ms
Start 408 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
IBMPlexSans-SemiBold-La... woff2 swap
Size 22 KB
Load time 208 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
IBMPlexSans-Regular-Lat... woff2 swap
Size 21 KB
Load time 194 ms
Start 1.1 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 ~63 KB and ~126 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
Network Waterfall
96 requests over 2003ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 2.2 shttps://wunderground.com// https://wunderground.com/ — 301 — 1.1 KiB — 79 ms — http/1.1https://www.wunderground.com/www.wunderground.com/ https://www.wunderground.com/ — 200 — 54.0 KiB — 162 ms — h2https://z.moatads.com/weatherprebidheader264491819464/moatheader.jsz.moatads.com/weatherprebidheader26... https://z.moatads.com/weatherprebidheader264491819464/moatheader.js — -1 — 0 B — 12 ms — https://fonts.googleapis.com/icon?family=Material+Iconsfonts.googleapis.com/icon?family=Ma... https://fonts.googleapis.com/icon?family=Material+Icons — 200 — 817 B — 97 ms — h2https://www.wunderground.com/bundle-next/styles-YGHHLK3N.csswww.wunderground.com/bundle-next/st... https://www.wunderground.com/bundle-next/styles-YGHHLK3N.css — 200 — 44.3 KiB — 19 ms — h2https://www.wunderground.com/assets/js/new-relic/new-relic.prod.ext.jswww.wunderground.com/assets/js/new-... https://www.wunderground.com/assets/js/new-relic/new-relic.prod.ext.js — 200 — 20.5 KiB — 43 ms — h2https://www.wunderground.com/static/i/misc/twc-white.svgwww.wunderground.com/static/i/misc/... https://www.wunderground.com/static/i/misc/twc-white.svg — 200 — 18.0 KiB — 149 ms — h2https://www.wunderground.com/static/i/misc/twc-knockout.svgwww.wunderground.com/static/i/misc/... https://www.wunderground.com/static/i/misc/twc-knockout.svg — 200 — 14.8 KiB — 97 ms — h2https://www.wunderground.com/bundle-next/chunk-LMKFTSAU.jswww.wunderground.com/bundle-next/ch... https://www.wunderground.com/bundle-next/chunk-LMKFTSAU.js — 200 — 19.7 KiB — 46 ms — h2https://www.wunderground.com/bundle-next/chunk-5OLAMIUU.jswww.wunderground.com/bundle-next/ch... https://www.wunderground.com/bundle-next/chunk-5OLAMIUU.js — 200 — 5.3 KiB — 45 ms — h2https://www.wunderground.com/bundle-next/chunk-KYHM4T5F.jswww.wunderground.com/bundle-next/ch... https://www.wunderground.com/bundle-next/chunk-KYHM4T5F.js — 200 — 271.7 KiB — 65 ms — h2https://www.wunderground.com/bundle-next/chunk-B5YGGBPK.jswww.wunderground.com/bundle-next/ch... https://www.wunderground.com/bundle-next/chunk-B5YGGBPK.js — 200 — 855 B — 49 ms — h2https://www.wunderground.com/bundle-next/chunk-4R7TFJ2A.jswww.wunderground.com/bundle-next/ch... https://www.wunderground.com/bundle-next/chunk-4R7TFJ2A.js — 200 — 6.9 KiB — 50 ms — h2https://www.wunderground.com/bundle-next/chunk-WPW6PZDG.jswww.wunderground.com/bundle-next/ch... https://www.wunderground.com/bundle-next/chunk-WPW6PZDG.js — 200 — 67.8 KiB — 61 ms — h2https://www.wunderground.com/bundle-next/chunk-GAL4ENT6.jswww.wunderground.com/bundle-next/ch... https://www.wunderground.com/bundle-next/chunk-GAL4ENT6.js — 200 — 1.2 KiB — 53 ms — h2https://www.wunderground.com/bundle-next/polyfills-FFHMD2TL.jswww.wunderground.com/bundle-next/po... https://www.wunderground.com/bundle-next/polyfills-FFHMD2TL.js — 200 — 12.7 KiB — 54 ms — h2https://www.wunderground.com/bundle-next/main-PW6DO3T3.jswww.wunderground.com/bundle-next/ma... https://www.wunderground.com/bundle-next/main-PW6DO3T3.js — 200 — 14.3 KiB — 56 ms — h2https://www.wunderground.com/static/i/misc/wu-knockout.svgwww.wunderground.com/static/i/misc/... https://www.wunderground.com/static/i/misc/wu-knockout.svg — 200 — 20.5 KiB — 73 ms — h2https://www.wunderground.com/static/i/misc/sr-knockout.pngwww.wunderground.com/static/i/misc/... https://www.wunderground.com/static/i/misc/sr-knockout.png — 200 — 5.6 KiB — 68 ms — h2https://www.wunderground.com/akam/13/42441b5fwww.wunderground.com/akam/13/42441b... https://www.wunderground.com/akam/13/42441b5f — 200 — 9.6 KiB — 163 ms — h2https://www.wunderground.com/bundle-next/scripts-LHEAU6G4.jswww.wunderground.com/bundle-next/sc... https://www.wunderground.com/bundle-next/scripts-LHEAU6G4.js — 200 — 24.9 KiB — 39 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABlgAAAAGCAIAAAAgxgSnAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJb…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABlgAAAAGCAIAAAAgxgSnAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJb… — 200 — 0 B — 0 ms — datahttps://www.wunderground.com/static/i/o/sprite-common-grid.png?v=1.7www.wunderground.com/static/i/o/spr... https://www.wunderground.com/static/i/o/sprite-common-grid.png?v=1.7 — 200 — 52.7 KiB — 76 ms — h2https://www.wunderground.com/static/i/o/sprite-common-vert.png?v=1.21www.wunderground.com/static/i/o/spr... https://www.wunderground.com/static/i/o/sprite-common-vert.png?v=1.21 — 200 — 9.3 KiB — 72 ms — h2https://www.wunderground.com/static/images/icons/adchoices.pngwww.wunderground.com/static/images/... https://www.wunderground.com/static/images/icons/adchoices.png — 200 — 3.4 KiB — 70 ms — h2https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2fonts.gstatic.com/s/roboto/v51/KFO7... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 200 — 42.2 KiB — 54 ms — h3https://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2fonts.gstatic.com/s/materialicons/v... https://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2 — 200 — 125.4 KiB — 72 ms — h3data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAQAElEQVR4AeycCZhUxbXHT3UPMwg4q…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAQAElEQVR4AeycCZhUxbXHT3UPMwg4q… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACGFjVEwAAAABAAAAAcMq2TYAAAANS…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACGFjVEwAAAABAAAAAcMq2TYAAAANS… — 200 — 0 B — 0 ms — datahttps://www.wunderground.com/api/v1/script/upsxSdkScript.jswww.wunderground.com/api/v1/script/... 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https://cdn.privacy-mgmt.com/wrapper/v2/messages?hasCsp=true&env=prod&body=%7B%22accountId%22%3A1763%2C%22campaignEnv%22%3A%22prod%22%2C%22campaigns%22%3A%7B%22gdpr%22%3A%7B%22consentStatus%22%3A%7B%7D%2C%22targetingParams%22%3A%7B%7D%7D%7D%2C%22clientMMSOrigin%22%3A%22https%3A%2F%2Fcdn.privacy-mgmt.com%22%2C%22hasCSP%22%3Atrue%2C%22includeData%22%3A%7B%22localState%22%3A%7B%22type%22%3A%22string%22%7D%2C%22actions%22%3A%7B%22type%22%3A%22RecordString%22%7D%2C%22cookies%22%3A%7B%22type%22%3A%22RecordString%22%7D%7D%2C%22propertyHref%22%3A%22https%3A%2F%2Frestricted.wunderground.com-prod%2F%22%7D&localState=null&metadata=%7B%22gdpr%22%3A%7B%22applies%22%3Atrue%7D%7D&nonKeyedLocalState=null&ch=488561908497545851af6a&scriptVersion=4.40.1&scriptType=unified — 200 — 10.5 KiB — 6 ms — h2https://nr-events.taboola.com/newsroom/1.0/theweatherchannel-wunderground/get-action?page.url=https%3A%2F%2Fwww.wunderground.com%2F&view.id=172835424567264071&page.template=home&page.dashboard=homenr-events.taboola.com/newsroom/1.0/... https://nr-events.taboola.com/newsroom/1.0/theweatherchannel-wunderground/get-action?page.url=https%3A%2F%2Fwww.wunderground.com%2F&view.id=172835424567264071&page.template=home&page.dashboard=home — 200 — 295 B — 31 ms — h2https://nr-events.taboola.com/newsroom/1.0/theweatherchannel-wunderground/notify-impression?page.url=https%3A%2F%2Fwww.wunderground.com%2F&view.id=172835424567264071&page.template=home&page.dashboard=homenr-events.taboola.com/newsroom/1.0/... https://nr-events.taboola.com/newsroom/1.0/theweatherchannel-wunderground/notify-impression?page.url=https%3A%2F%2Fwww.wunderground.com%2F&view.id=172835424567264071&page.template=home&page.dashboard=home — 204 — 58 B — 33 ms — h2https://cdn.privacy-mgmt.com/wrapper/v2/pv-data?hasCsp=true&env=prod&ch=488561908497545851af6a&scriptVersion=4.40.1&scriptType=unifiedcdn.privacy-mgmt.com/wrapper/v2/pv-... https://cdn.privacy-mgmt.com/wrapper/v2/pv-data?hasCsp=true&env=prod&ch=488561908497545851af6a&scriptVersion=4.40.1&scriptType=unified — 200 — 0 B — 35 ms — h2https://api.amplitude.com/api.amplitude.com/ https://api.amplitude.com/ — 200 — 136 B — 186 ms — h2https://cdn.privacy-mgmt.com/wrapper/v2/pv-data?hasCsp=true&env=prod&ch=488561908497545851af6a&scriptVersion=4.40.1&scriptType=unifiedcdn.privacy-mgmt.com/wrapper/v2/pv-... https://cdn.privacy-mgmt.com/wrapper/v2/pv-data?hasCsp=true&env=prod&ch=488561908497545851af6a&scriptVersion=4.40.1&scriptType=unified — 200 — 737 B — 48 ms — h2https://cdn.privacy-mgmt.com/index.html?hasCsp=true&message_id=1225696&consentUUID=null&consent_origin=https%3A%2F%2Fcdn.privacy-mgmt.com%2Fconsent%2Ftcfv2&preload_message=true&version=v1&consentLanguage=encdn.privacy-mgmt.com/index.html?has... https://cdn.privacy-mgmt.com/index.html?hasCsp=true&message_id=1225696&consentUUID=null&consent_origin=https%3A%2F%2Fcdn.privacy-mgmt.com%2Fconsent%2Ftcfv2&preload_message=true&version=v1&consentLanguage=en — 200 — 2.2 KiB — 7 ms — h2https://cdn.privacy-mgmt.com/Notice.30929.csscdn.privacy-mgmt.com/Notice.30929.c... https://cdn.privacy-mgmt.com/Notice.30929.css — 200 — 6.7 KiB — 7 ms — h2https://cdn.privacy-mgmt.com/polyfills.01516.jscdn.privacy-mgmt.com/polyfills.0151... https://cdn.privacy-mgmt.com/polyfills.01516.js — 200 — 2.3 KiB — 6 ms — h2https://cdn.privacy-mgmt.com/Notice.8f529.jscdn.privacy-mgmt.com/Notice.8f529.j... https://cdn.privacy-mgmt.com/Notice.8f529.js — 200 — 91.2 KiB — 13 ms — h2https://js-agent.newrelic.com/nr-spa-1.284.1.min.jsjs-agent.newrelic.com/nr-spa-1.284.... https://js-agent.newrelic.com/nr-spa-1.284.1.min.js — 200 — 32.8 KiB — 16 ms — h2https://www.wunderground.com/static/favicon.pngwww.wunderground.com/static/favicon... https://www.wunderground.com/static/favicon.png — 200 — 3.0 KiB — 59 ms — h2https://cdn.privacy-mgmt.com/consent/tcfv2/vendor-list/categories?siteId=33430cdn.privacy-mgmt.com/consent/tcfv2/... https://cdn.privacy-mgmt.com/consent/tcfv2/vendor-list/categories?siteId=33430 — 200 — 2.5 KiB — 3 ms — h2https://bam.nr-data.net/1/NRBR-dec0e3728cba165f80c?a=1386253068&sa=1&v=1.284.1&t=Unnamed%20Transaction&rst=1674&ck=0&s=f5b1c59e50e31255&ref=https://www.wunderground.com/&ptid=3446107e4b8382bb&af=err,spa,xhr,stn,ins&be=240&fe=1381&dc=407&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776801550885,%22n%22:0,%22f%22:81,%22dn%22:82,%22dne%22:131,%22c%22:131,%22s%22:132,%22ce%22:138,%22rq%22:138,%22rp%22:241,%22rpe%22:244,%22di%22:413,%22ds%22:646,%22de%22:647,%22dc%22:1619,%22l%22:1619,%22le%22:1621%7D,%22navigation%22:%7B%7D%7D&fp=440&fcp=440bam.nr-data.net/1/NRBR-dec0e3728cba... https://bam.nr-data.net/1/NRBR-dec0e3728cba165f80c?a=1386253068&sa=1&v=1.284.1&t=Unnamed%20Transaction&rst=1674&ck=0&s=f5b1c59e50e31255&ref=https://www.wunderground.com/&ptid=3446107e4b8382bb&af=err,spa,xhr,stn,ins&be=240&fe=1381&dc=407&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776801550885,%22n%22:0,%22f%22:81,%22dn%22:82,%22dne%22:131,%22c%22:131,%22s%22:132,%22ce%22:138,%22rq%22:138,%22rp%22:241,%22rpe%22:244,%22di%22:413,%22ds%22:646,%22de%22:647,%22dc%22:1619,%22l%22:1619,%22le%22:1621%7D,%22navigation%22:%7B%7D%7D&fp=440&fcp=440 — 200 — 744 B — 161 ms — http/1.1https://cdn.privacy-mgmt.com/consent/tcfv2/vendor-list/categories?siteId=33430&consentLanguage=encdn.privacy-mgmt.com/consent/tcfv2/... https://cdn.privacy-mgmt.com/consent/tcfv2/vendor-list/categories?siteId=33430&consentLanguage=en — 200 — 2.5 KiB — 9 ms — h2https://www.wunderground.com/static/favicon.pngwww.wunderground.com/static/favicon... https://www.wunderground.com/static/favicon.png — 200 — 460 B — 20 ms — h2https://bam.nr-data.net/events/1/NRBR-dec0e3728cba165f80c?a=1386253068&sa=1&v=1.284.1&t=Unnamed%20Transaction&rst=1853&ck=0&s=f5b1c59e50e31255&ref=https://www.wunderground.com/&ptid=3446107e4b8382bbbam.nr-data.net/events/1/NRBR-dec0e... https://bam.nr-data.net/events/1/NRBR-dec0e3728cba165f80c?a=1386253068&sa=1&v=1.284.1&t=Unnamed%20Transaction&rst=1853&ck=0&s=f5b1c59e50e31255&ref=https://www.wunderground.com/&ptid=3446107e4b8382bb — 200 — 411 B — 149 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1223ms · 778KB · $16/mo
www.wunderground.com
Other
Costly
Execution 442ms
Transfer 54 KB
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 212ms
Transfer 0 KB
Monthly Cost $3/mo
www.wunderground.com
Other
Optional
Execution 170ms
Transfer 13 KB
Monthly Cost $2/mo
www.wunderground.com
Other
Optional
Execution 116ms
Transfer 20 KB
Monthly Cost $2/mo
cdn.taboola.com
Other
Optional
Execution 81ms
Transfer 319 KB
Unused 72%
Monthly Cost $1/mo
www.wunderground.com
Other
Optional
Execution 78ms
Transfer 68 KB
Monthly Cost $1/mo
www.wunderground.com
Other
Optional
Execution 65ms
Transfer 272 KB
Unused 55%
Monthly Cost $1/mo
js-agent.newrelic.com
Other
Optional
Execution 60ms
Transfer 33 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.wunderground.com adds 442ms and costs ~$6/month
  • Unattributable adds 212ms and costs ~$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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.wunderground.com takes 442ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 212ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

72% of cdn.taboola.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

55% of www.wunderground.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

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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