Measure what users feel
Field data first; lab second. Pick the templates that drive revenue.
Performance optimization
Make every millisecond earn its keep
We diagnose and fix Core Web Vitals, bundle weight, and third-party drag — so pages load fast on real devices, not only on a developer laptop.
Lighthouse
Chrome
Next.js
Vercel
Cloudflare
Core Web Vitals
Spec sheet — product requirements, not vanity scores
Field data first. Lab confirms. Every metric maps to an owner on the page.
SignalWhat we ownGate
LCPOwned element & image pipeline
LCP — Largest Contentful Paint
Hero images, fonts, and server TTFB tuned so the main content appears quickly on mid-tier mobiles.
INPInteraction path audits
INP — Interaction to Next Paint
Main-thread work, long tasks, and hydration trimmed so taps and clicks feel immediate.
CLSLayout stability fixes
CLS — Cumulative Layout Shift
Reserved space for media, ads, and late-loading UI so the page does not jump under the user's finger.
CIBudgets that block regressions
TTFB & caching
Origin and CDN strategy so the first byte is not the silent killer behind every other metric.
Heat map
Where milliseconds burn
01
Unowned LCP element
Hero images without priority, wrong dimensions, or late discovery — the paint waits on guesswork.
02
Main-thread congestion
Hydration, analytics, and chat widgets compete with the click the user just made.
03
Layout that jumps
Ads, embeds, and late fonts push content after first paint — CLS is a design debt metric.
04
Cold origin, hot CDN miss
Cache rules that never match reality — every visit pays full TTFB tax.
Playbook
One continuous loop
Find the critical path
Waterfall the LCP element, long tasks, and layout instabilities.
Ship high-leverage fixes
Images, fonts, caching, and third parties before micro-optimizations.
Re-measure & lock budgets
Prove movement in RUM, then protect it with CI and ownership.
Field + lab diagnosis
CrUX / RUM where available, Lighthouse and WebPageTest traces, and a ranked backlog tied to business pages.
Image & font pipelines
Correct formats, sizes, priority hints, and font loading so LCP elements are deliberate — not accidental.
Bundle & hydration
Code-split routes, trim unused libraries, and reduce hydration cost on interactive islands.
Caching & CDN
Cache headers, ISR/edge rules, and HTML/API TTLs that match how often content actually changes.
Third-party control
Tags, chat widgets, and A/B tools loaded with consent and budgets so marketing does not own the main thread.
CI performance budgets
Automated checks on PRs so a new feature cannot quietly undo months of speed work.
Stack
Instruments we actually run
Google Analytics
Sentry
Datadog
Grafana
React
TypeScript
Webpack
Vite
esbuild
- AWS
- Cloudinary
Fastly
Docker
- AWS
- Cloudinary
MeasureLighthouse · Chrome · Google Analytics · Sentry · Datadog · Grafana
Build & shipNext.js · React · TypeScript · Webpack · Vite · esbuild
Edge & mediaVercel · Cloudflare · AWS · Cloudinary · Fastly · Docker
Proof
Scoreboard
4.2s2.1s
Marketing site · image pipeline
Hero LCP cut in half
AVIF srcset, fetchpriority, and font preload moved field LCP from ~4.2s to under 2.2s on mid-tier Android.
LCP field480ms150ms
E-commerce · INP
Checkout taps feel instant
Deferred tag manager and split cart islands — Interaction to Next Paint dropped below 200ms on the pay path.
INP p75Ad hocCI gate
CI · Lighthouse
Budgets that stick
Bundle and LCP budgets on every PR — regressions fail the build before marketing notices field data slip.
Release guardOutcomes
Speed tied to journeys
- 01
Marketing site under 2.5s LCP
Hero pipeline and font strategy fixed; paid traffic finally lands on a usable first view.
- 02
Checkout INP recovered
Heavy analytics and hydration deferred; add-to-cart and pay buttons respond on mid-range Androids.
- 03
CLS eliminated on article templates
Ad and embed slots reserved; bounce from layout jump drops on long-form pages.
- 04
Regression-proof releases
Bundle and Lighthouse budgets in CI catch slow PRs before they hit production.
Why Zupitrix
Performance as release discipline
- Field data firstCrUX and RUM drive the backlog — lab scores are validation, not the North Star.
- Critical path, not vanityWe chase the LCP element and long tasks on money pages before micro-tweaks.
- Ship with proofBefore/after traces and stakeholder-ready summaries so speed work is visible.
- Guardrails after launchCI budgets and third-party ownership so the next campaign cannot undo the win.
- 01
Baseline
Capture field and lab metrics on priority URLs across key geos and devices.
- 02
Prioritize
Score fixes by impact and effort — quick wins first, architecture changes next.
- 03
Implement
Ship changes behind staging checks with before/after traces for stakeholders.
- 04
Govern
Budgets, dashboards, and a cadence to keep third parties honest after launch.
FAQ
Questions about performance optimization
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