Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
458 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.23 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
183 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.
2.74 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.
3.75 s
Page Load Progression
FPage Weight BudgetAction9.0 MB transferred, 119 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
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.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction79% third-party, 0 ms blockingFIX
DJS Execution CostAction2430ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://trezor.io/_next/static/chunks/0lde~4p3--bio.js | 1032ms | 927ms | 10ms | 1st |
| Unattributable | 490ms | 22ms | 0ms | 3rd |
| https://trezor.io/ | 239ms | 5ms | 28ms | 1st |
| https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSdk.lib.4c6726a9.js | 145ms | 134ms | 8ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-692809723&cx=c>m=4e64k0 | 130ms | 110ms | 19ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5VGQHHL | 101ms | 73ms | 27ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-14918036&cx=c>m=4e64k0 | 95ms | 80ms | 15ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-34JWL0HY2X&cx=c>m=4e64k0 | 77ms | 59ms | 16ms | 3rd |
| https://web.cmp.usercentrics.eu/ui/v/3.117.0/UsCmpController.19c71421.js | 69ms | 67ms | 1ms | 3rd |
| https://web.cmp.usercentrics.eu/ui/v/3.117.0/UcUsCmpView.6fcde5f7.js | 53ms | 16ms | 3ms | 3rd |
FJS BundlesAction42 scripts, 659 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://trezor.io/_next/static/chunks/152-_88w8y2mg.js | 159 KB | 145 KB (91%) | ✓ | 1st |
| https://trezor.io/_next/static/chunks/0qk~bzb6ko2bx.js | 71 KB | 67 KB (100%) | ✓ | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-34JWL0HY2X&cx=c>m=4e64k0 | 167 KB | 61 KB (37%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-692809723&cx=c>m=4e64k0 | 144 KB | 61 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5VGQHHL | 168 KB | 61 KB (36%) | ✓ | 3rd |
| https://trezor.io/_next/static/chunks/0lde~4p3--bio.js | 124 KB | 54 KB (43%) | ✓ | 1st |
| https://www.googletagmanager.com/gtag/js?id=DC-14918036&cx=c>m=4e64k0 | 131 KB | 52 KB (40%) | ✓ | 3rd |
| https://trezor.io/_next/static/chunks/04y8dge3f427g.js | 69 KB | 37 KB (54%) | ✓ | 1st |
| https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSdk.lib.4c6726a9.js | 56 KB | 35 KB (63%) | ✓ | 3rd |
| https://trezor.io/_next/static/chunks/0vgt6f7jck1ek.js | 48 KB | 30 KB (63%) | ✓ | 1st |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction119 resources · 9.0 MB · 659 KB savings availableFIX
~659.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 119 resources | 9.0 MiB | ||||||
BImage Optimization20 images, 0 KB saveableREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (271 KB)PASS
Web fonts
4
271 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
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+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
A+HTTP Cachingmax-age=7200 (2 hours)PASS
public, max-age=7200, s-maxage=7200
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 7200 | Cache for 2 hours |
| s-maxage | 7200 | CDN caches for 2 hours |
Network Waterfall119 requests over 2890msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 490ms | 0 KB | — | Kč60/mo | Costly |
web.cmp.usercentrics.eu web.cmp.usercentrics.eu | Other | 145ms | 56 KB | 63% | Kč18/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 130ms | 144 KB | 42% | Kč16/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 101ms | 168 KB | 36% | Kč12/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 95ms | 131 KB | 40% | Kč12/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 77ms | 167 KB | 37% | Kč9/mo | Optional |
web.cmp.usercentrics.eu web.cmp.usercentrics.eu | Other | 69ms | 10 KB | — | Kč8/mo | Optional |
web.cmp.usercentrics.eu web.cmp.usercentrics.eu | Other | 53ms | 17 KB | — | Kč7/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 490ms and costs ~Kč60/month
48% of JavaScript execution time comes from third-party scripts.
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
Unattributable takes 490ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
63% of web.cmp.usercentrics.eu's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev