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Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
94
GRADE
A
FIX
2
REVIEW
2
PASS
15
INFO
3

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

Mobile Desktop
100
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
100
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.

454 ms

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

454 ms

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

17 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.

454 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.02 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
22
15 PASS 2 REVIEW 2 FIX
D
Third-Party Impact
Action
94% third-party, 0 ms blocking
FIX
94% third-party, 0 ms blocking
Warning::
Third-party code accounts for 94% of page weight (315.6 KiB of 337.3 KiB)
Info::
Third-party blocking time is low (0 ms)
94%
First-party Third-party
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, no-cache, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, no-cache, must-revalidate

DirectiveValueMeaning
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
B
JS Bundles
2 scripts, 147 KB unused
REVIEW
2 scripts, 147 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-TRDF...: 81 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TTQ...: 66 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 147 KB
147 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-TRDF1R3E4Q&cx=c&gtm=4e6a61h1190 KB81 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TTQSW79C125 KB66 KB (53%)✓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

B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
A+
Page Weight Budget
337 KB transferred, 6 requests
PASS
337 KB transferred, 6 requests
Info::
Page weighs 1.0 MB (337 KB transferred)
Info::
6 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
337 KB / 2.4 MB budget
337 KB transferred
6 requests
0.07 g CO2 per page load
JavaScript 315.1 KiB 93%
CSS 11.3 KiB 3%
HTML 6.7 KiB 2%
Other 3.7 KiB 1%
Other 549 B 0%
0 2.4 MB 4.9 MB
Under budget
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+
Image Optimization
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
125ms total JS execution
PASS
125ms total JS execution
Info::
https://www.googletagmanager.com/gtag/js?id=G-TRDF...: 69ms CPU time
Info::
https://waterexamprep.com/: 56ms CPU time
Warning::
Third-party scripts: 69ms (55% of total)

Main Thread Breakdown

Script Evaluation 49% Style & Layout 23% Other 13% Script Parsing & Compilation 12%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-TRDF1R3E4Q&cx=c&gtm=4e6a61h169ms56ms11ms3rd
https://waterexamprep.com/56ms2ms1ms1st
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: no-store, no-cache, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: accept-encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A
Page Weight Inventory
6 resources · 337 KB · 147 KB savings available
PASS
6 resources · 337 KB · 147 KB savings available
Info::
Within 1MB page-weight target
Got: 337 KB
Info::
~147 KB of savings available
Warning::
3 third-party resources (94% of weight)
6 resources · 337.3 KiB · 3 third-party Within 1MB page-weight target
JavaScript 93% · 315.1 KiB
CSS 3% · 11.3 KiB
Document 3% · 10.4 KiB
Other 0% · 549 B

~147.2 KiB of savings available

Remove unused JavaScript: 147.2 KiB
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
6 requests over 753ms
INFO
0 ms 200 ms 400 ms 600 ms FCP 454 ms LCP 454 mshttps://waterexamprep.com// https://waterexamprep.com/ — 200 — 6.7 KiB — 155 ms — h3https://waterexamprep.com/assets/css/site.css?v=20260918-5/assets/css/site.css?v=20260918-5 https://waterexamprep.com/assets/css/site.css?v=20260918-5 — 200 — 11.3 KiB — 31 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-TTQSW79Cwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TTQSW79C — 200 — 125.2 KiB — 222 ms — h2https://www.googletagmanager.com/gtag/js?id=G-TRDF1R3E4Q&cx=c&gtm=4e6a61h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-TRDF1R3E4Q&cx=c&gtm=4e6a61h1 — 200 — 189.9 KiB — 105 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-TRDF1R3E4Q&gtm=45je6a61h1v9264675274z89264651282za20gzb9264651282zd9264651282xf1&_p=1791467156402&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&_eu=AAAAACAC&cid=2146719620.1791467157&frm=0&ibt=1&ngs=1&pscdl=denied&rcb=10&sr=800x600&uaa=x86&uab=64&uafvl=Not%2520A(Brand%3B99.0.0.0%7CChromium%3B154.0.8037.92&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115616986~115938466~115938469~118897920~118897930~120213116~120385423~120469145~120469153~121046263~121046271~121280970&sid=1791467156&sct=1&seg=0&dl=https%3A%2F%2Fwaterexamprep.com%2F&dt=Water%20%26%20Wastewater%20Operator%20Exam%20Prep%20%7C%20WaterExamPrep&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=630region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-TRDF1R3E4Q&gtm=45je6a61h1v9264675274z89264651282za20gzb9264651282zd9264651282xf1&_p=1791467156402&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&_eu=AAAAACAC&cid=2146719620.1791467157&frm=0&ibt=1&ngs=1&pscdl=denied&rcb=10&sr=800x600&uaa=x86&uab=64&uafvl=Not%2520A(Brand%3B99.0.0.0%7CChromium%3B154.0.8037.92&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115616986~115938466~115938469~118897920~118897930~120213116~120385423~120469145~120469153~121046263~121046271~121280970&sid=1791467156&sct=1&seg=0&dl=https%3A%2F%2Fwaterexamprep.com%2F&dt=Water%20%26%20Wastewater%20Operator%20Exam%20Prep%20%7C%20WaterExamPrep&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=630 — 204 — 549 B — 67 ms — h2https://waterexamprep.com/favicon.ico/favicon.ico https://waterexamprep.com/favicon.ico — 404 — 3.7 KiB — 114 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
55% of JavaScript execution is third-party
First-party Third-party 69ms · 190KB · €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 69ms
Transfer 190 KB
Unused 43%
Monthly Cost €1/mo

55% 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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