https://theseocover.com
Performance
· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
87
GRADE
B
FIX
3
REVIEW
3
PASS
17
INFO
4
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
27
90
100
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
4.82 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.27 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
146.69 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.006
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
22.55 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.
165.56 s
Page Load Progression
1.7 s
3.4 s
5.1 s
6.8 s
8.5 s 10.2 s
11.9 s
13.6 sChecks
2717 PASS 3 REVIEW 3 FIX
DPage Weight BudgetAction2.3 MB transferred, 40 requestsFIX
Page Weight Budget
Action2.3 MB transferred, 40 requests
2.3 MB transferred, 40 requests
Info::
Page weighs 11.2 MB (2.3 MB transferred)
Warning::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 MB
Info::
40 HTTP requests
Info::
Estimated 0.47 g CO2 per page load
2.3 MB transferred
40 requests
0.47 g CO2 per page load
Images 1.3 MiB 56%
Other 553.7 KiB 24%
JavaScript 230.0 KiB 10%
HTML 161.7 KiB 7%
Fonts 59.7 KiB 3%
CSS 3.0 KiB 0%
Other 1.5 KiB 0%
Other 935 B 0%
Other 925 B 0%
Other 463 B 0%
0 2.4 MB 4.9 MB
Approaching limit
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
FJS Execution CostAction175082ms total JS executionFIX
JS Execution Cost
Action175082ms total JS execution
175082ms total JS execution
Warning::
https://theseocover.com/polyfills-5CFQRCPP.js: 166361ms CPU time
Warning::
Unattributable: 4177ms CPU time
Warning::
https://theseocover.com/chunk-PTNTPL5X.js: 2147ms CPU time
Warning::
https://theseocover.com/: 1681ms CPU time
Warning::
https://theseocover.com/chunk-HKWSKVEF.js: 520ms CPU time
Info::
Third-party scripts: 84ms (0% of total)
Main Thread Breakdown
Other 89% Script Evaluation 10%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://theseocover.com/polyfills-5CFQRCPP.js | 166361ms | 12568ms | 0ms | 1st |
| Unattributable | 4177ms | 1496ms | 0ms | 1st |
| https://theseocover.com/chunk-PTNTPL5X.js | 2147ms | 2110ms | 1ms | 1st |
| https://theseocover.com/ | 1681ms | 37ms | 2ms | 1st |
| https://theseocover.com/chunk-HKWSKVEF.js | 520ms | 499ms | 2ms | 1st |
| https://theseocover.com/chunk-AQ7UY2OY.js | 113ms | 71ms | 1ms | 1st |
| https://static.cloudflareinsights.com/beacon.min.js/v31edd6df95cf4e85bb4c19e7a9bdbcba1788362987495 | 84ms | 71ms | 1ms | 3rd |
DPage Weight InventoryAction40 resources · 2.3 MB · 24 KB savings availableFIX
Page Weight Inventory
Action40 resources · 2.3 MB · 24 KB savings available
40 resources · 2.3 MB · 24 KB savings available
Warning::
Page weight 2.3 MB exceeds 1 MB target by 1.3 MB
Got: 2.3 MB Expected: ≤ 1 MB
Warning::
13 third-party resources (59% of weight)
Info::
3 resources over 200KB
40 resources · 2.3 MiB · 13 third-party 1.3 MiB over 1MB target
Image 56% · 1.3 MiB
Other 24% · 556.0 KiB
JavaScript 10% · 230.0 KiB
Document 7% · 161.7 KiB
Font 3% · 59.7 KiB
CSS 0% · 3.0 KiB
~23.7 KiB of savings available
Remove unused JavaScript: 23.7 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 40 resources | 2.3 MiB | ||||||
BThird-Party Impact59% third-party, 0 ms blockingREVIEW
Third-Party Impact
59% third-party, 0 ms blocking
59% third-party, 0 ms blocking
Warning::
Third-party code accounts for 59% of page weight (1.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
41%
59%
First-party Third-party
BImage Optimization10 images, 0 KB saveableREVIEW
Image Optimization
10 images, 0 KB saveable
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 1.3 MB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
BHTTP Cachingpublic, max-age=0, must-revalidateREVIEW
HTTP Caching
public, max-age=0, must-revalidate
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
public, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Font Loading2 fonts (60 KB)PASS
Font Loading
2 fonts (60 KB)
2 fonts (60 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
60 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
uU9NCBsR6Z2vfE9aq3bh3dS... woff2 swap
Size 35 KB
Load time 23 ms
Start 303 ms
Risk FOUT — text flashes from fallback to web font
xn7gYHE41ni1AdIRggexSg.... woff2 swap
Size 24 KB
Load time 22 ms
Start 303 ms
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)
A+JS Bundles15 scripts, 24 KB unusedPASS
JS Bundles
15 scripts, 24 KB unused
15 scripts, 24 KB unused
Warning::
https://theseocover.com/chunk-HKWSKVEF.js: 24 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 24 KB
24 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://theseocover.com/chunk-HKWSKVEF.js | 74 KB | 24 KB (32%) | ✓ | 1st |
| https://theseocover.com/main-YKN2ZBY7.js | 17 KB | — | ✓ | 1st |
| https://theseocover.com/chunk-XWZJR4FP.js | 1 KB | — | ✓ | 1st |
| https://theseocover.com/chunk-IK3OFPV3.js | 8 KB | — | ✓ | 1st |
| https://theseocover.com/chunk-4CLCTAJ7.js | 1 KB | — | ✓ | 1st |
| https://theseocover.com/polyfills-5CFQRCPP.js | 13 KB | — | ✓ | 1st |
| https://theseocover.com/chunk-XYWWJDJG.js | 3 KB | — | ✓ | 1st |
| https://theseocover.com/chunk-DVDKC65N.js | 22 KB | — | ✓ | 1st |
| https://theseocover.com/chunk-PWQO5AB5.js | 22 KB | — | ✓ | 1st |
| https://theseocover.com/chunk-HVFDR7TH.js | 3 KB | — | ✓ | 1st |
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
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource Hints2 hints, 0 missing preconnectsPASS
Resource Hints
2 hints, 0 missing preconnects
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)
Current Resource Hints
preconnect 2
preload—
dns-prefetch—
prefetch—
2 resource hints configured
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
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 CompressionDocument response uses brotliPASS
Document Compression
Document response uses brotli
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 PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Main HTML Cache-ControlMain HTML max-age=0 (≤ 5min) is appropriatePASS
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, must-revalidate
A+Server-Timing Observability3 Server-Timing entries advertisedPASS
Server-Timing Observability
3 Server-Timing entries advertised
3 Server-Timing entries advertised
Info::
Server-Timing header advertises 3 timing entries
AServer Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Warning::
Compressed response missing `Vary` header
The page is served with `Content-Encoding: br` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
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+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
AJavaScript Blocking1 JS blocking issue(s) detectedPASS
JavaScript Blocking
1 JS blocking issue(s) detected
1 JS blocking issue(s) detected
Warning::
Total JS execution time is 175.1 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
CSS Performance Depth
No CSS performance depth issues detected
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
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 Waterfall40 requests over 3594msINFO
Network Waterfall
40 requests over 3594ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
0% of JavaScript execution is third-party
First-party Third-party 84ms · 10KB · $1/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 84ms | 10 KB | — | $1/mo | Optional |
static.cloudflareinsights.com
Other
Execution 84ms
Transfer 10 KB
Monthly Cost $1/mo
Image Optimization27 images, 0 KB total, 0 KB wastedINFO
Image Optimization
27 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
27
Total Size
0 KB
Oversized
3
26 missing alt text 27 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.