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https://openssl.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
96
GRADE
A
FIX
0
REVIEW
2
PASS
11
INFO
2

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

Mobile Desktop
97
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
50
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.

478 ms

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

1.24 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.

0.008

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

507 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.

1.24 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
11 PASS 2 REVIEW
B
Image Optimization
3 images, 0 KB saveable
REVIEW
3 images, 0 KB saveable
Warning::
https://openssl.org/images/cryptlib_logo_393_265.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openssl.org/images/openssl_logo_library_39... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openssl.org/images/bouncy_castle.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
3 images 235 KB
0 oversized -0 KB
3 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
HTTP Caching
public,no-cache
REVIEW
public,no-cache
Info::
Cache-Control header is set
Got: public,no-cache
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

public,no-cache

DirectiveValueMeaning
public—Any cache may store this response
no-cache—Cache but always revalidate first
A
Page Weight Budget
902 KB transferred, 16 requests
PASS
902 KB transferred, 16 requests
Info::
Page weighs 902 KB (902 KB transferred)
Info::
Fonts are 497 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 497 KB
Info::
16 HTTP requests
Info::
Estimated 0.18 g CO2 per page load
902 KB / 2.4 MB budget
902 KB transferred
16 requests
0.18 g CO2 per page load
Fonts 497.3 KiB 55%
Images 234.9 KiB 26%
CSS 156.2 KiB 17%
HTML 7.5 KiB 1%
Other 4.1 KiB 0%
JavaScript 1.6 KiB 0%
Other 490 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

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

A+
Third-Party Impact
0% third-party, 0 ms blocking
PASS
0% third-party, 0 ms blocking
Info::
Third-party code accounts for 0% of page weight (2.1 KiB of 902.0 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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+
JS Execution Cost
118ms total JS execution
PASS
118ms total JS execution
Info::
https://openssl.org/: 63ms CPU time
Info::
Unattributable: 54ms CPU time
Info::
Third-party scripts: 54ms (46% of total)

Main Thread Breakdown

Other 49% Style & Layout 33% Parse HTML & CSS 8% Script Evaluation 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://openssl.org/63ms2ms1ms1st
Unattributable54ms2ms0ms3rd
A+
Font Loading
4 fonts (497 KB)
PASS
4 fonts (497 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

497 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 FCP 478 ms LCP 1.2 shttps://openssl.org/webfonts/Roboto-Regular.ttfRoboto-Regular.ttf https://openssl.org/webfonts/Roboto-Regular.ttf — 142.6 KiB — 139 ms — font-display: swaphttps://openssl.org/webfonts/Roboto-Light.woff2Roboto-Light.woff2 https://openssl.org/webfonts/Roboto-Light.woff2 — 61.8 KiB — 130 ms — font-display: swaphttps://openssl.org/webfonts/Roboto-BoldItalic.ttfRoboto-BoldItalic.ttf https://openssl.org/webfonts/Roboto-BoldItalic.ttf — 149.5 KiB — 134 ms — font-display: swaphttps://openssl.org/webfonts/Roboto-Bold.ttfRoboto-Bold.ttf https://openssl.org/webfonts/Roboto-Bold.ttf — 143.4 KiB — 136 ms — font-display: swap
Roboto-Regular.ttf ttf swap
Size 143 KB
Load time 139 ms
Start 336 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Roboto-Light.woff2 woff2 swap
Size 62 KB
Load time 130 ms
Start 337 ms
Risk FOUT — text flashes from fallback to web font
Roboto-BoldItalic.ttf ttf swap
Size 150 KB
Load time 134 ms
Start 337 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Roboto-Bold.ttf ttf swap
Size 143 KB
Load time 136 ms
Start 337 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~348 KB and ~696 ms

A+
JS Bundles
1 scripts, 0 KB unused
PASS
1 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://api.transpond.io/tracker?am=MzgyOTE%253D2 KB—✓3rd
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+
Page Weight Inventory
16 resources · 902 KB · 0 KB savings available
PASS
16 resources · 902 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 902 KB
Info::
3 third-party resources (0% of weight)
16 resources · 902.0 KiB · 3 third-party Within 1MB page-weight target
Font 55% · 497.3 KiB
Image 26% · 234.9 KiB
CSS 17% · 156.2 KiB
Document 1% · 11.6 KiB
JavaScript 0% · 1.6 KiB
Other 0% · 490 B
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

Network Waterfall
16 requests over 623ms
INFO
0 ms 500 ms 1.0 s FCP 478 ms LCP 1.2 shttps://openssl.org// https://openssl.org/ — 200 — 7.5 KiB — 129 ms — h2https://openssl.org/css/main.abe249895d3af7f37653d265973a575e7fbd4ad64b517d07ffdc2b164fe3f42d.css/css/main.abe249895d3af7f37653d2659... https://openssl.org/css/main.abe249895d3af7f37653d265973a575e7fbd4ad64b517d07ffdc2b164fe3f42d.css — 200 — 44.9 KiB — 135 ms — h2https://openssl.org/css/fontawesome.min.80a5cf80e4ba6d1ff172b4995ad5ce996071022227860700308ed797fbd150ad.css/css/fontawesome.min.80a5cf80e4ba6d... https://openssl.org/css/fontawesome.min.80a5cf80e4ba6d1ff172b4995ad5ce996071022227860700308ed797fbd150ad.css — 200 — 85.7 KiB — 123 ms — h2https://openssl.org/css/brands.9c662012d93fb448c96f67697bbee60ae06d6552398ca9487dcc79df4a032eb3.css/css/brands.9c662012d93fb448c96f676... https://openssl.org/css/brands.9c662012d93fb448c96f67697bbee60ae06d6552398ca9487dcc79df4a032eb3.css — 200 — 24.7 KiB — 136 ms — h2https://openssl.org/css/solid.40e9c76835b2f8346bf5a2dda24f8a0ec0624a4a2232ad15dad086f44a672772.css/css/solid.40e9c76835b2f8346bf5a2dd... https://openssl.org/css/solid.40e9c76835b2f8346bf5a2dda24f8a0ec0624a4a2232ad15dad086f44a672772.css — 200 — 890 B — 118 ms — h2https://openssl.org/images/openssl_logo_library_393_265.png/images/openssl_logo_library_393_26... https://openssl.org/images/openssl_logo_library_393_265.png — 200 — 12.3 KiB — 145 ms — h2https://openssl.org/images/bouncy_castle.png/images/bouncy_castle.png https://openssl.org/images/bouncy_castle.png — 200 — 161.5 KiB — 127 ms — h2https://openssl.org/images/cryptlib_logo_393_265.png/images/cryptlib_logo_393_265.png https://openssl.org/images/cryptlib_logo_393_265.png — 200 — 61.1 KiB — 134 ms — h2https://api.transpond.io/tracker?am=MzgyOTE%253Dapi.transpond.io/tracker?am=MzgyOTE... https://api.transpond.io/tracker?am=MzgyOTE%253D — 200 — 1.6 KiB — 61 ms — h2https://api.transpond.io/trackerapi.transpond.io/tracker https://api.transpond.io/tracker — 204 — 0 B — 39 ms — h2https://api.transpond.io/trackerapi.transpond.io/tracker https://api.transpond.io/tracker — 200 — 490 B — 26 ms — h2https://openssl.org/webfonts/Roboto-Regular.ttf/webfonts/Roboto-Regular.ttf https://openssl.org/webfonts/Roboto-Regular.ttf — 200 — 142.6 KiB — 139 ms — h3https://openssl.org/webfonts/Roboto-Light.woff2/webfonts/Roboto-Light.woff2 https://openssl.org/webfonts/Roboto-Light.woff2 — 200 — 61.8 KiB — 130 ms — h3https://openssl.org/webfonts/Roboto-BoldItalic.ttf/webfonts/Roboto-BoldItalic.ttf https://openssl.org/webfonts/Roboto-BoldItalic.ttf — 200 — 149.5 KiB — 134 ms — h3https://openssl.org/webfonts/Roboto-Bold.ttf/webfonts/Roboto-Bold.ttf https://openssl.org/webfonts/Roboto-Bold.ttf — 200 — 143.4 KiB — 136 ms — h3https://openssl.org/favicon.ico/favicon.ico https://openssl.org/favicon.ico — 404 — 4.1 KiB — 122 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
46% of JavaScript execution is third-party
First-party Third-party 54ms · 0KB · $0/mo
Unattributable
Other
Optional
Execution 54ms
Transfer 0 KB
Monthly Cost $0/mo

46% 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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