Web performance and technical SEO
Web performance and technical SEO are the work of making websites and applications fast for users and easy for search engines and AI assistants to crawl, understand and index. Wisalo, a software house based in Curitiba, Brazil, founded in 2019, optimizes Core Web Vitals, rendering, assets and technical structure based on measurement, not assumptions.
Overview
Speed affects how people perceive a brand and whether they complete a purchase, a sign-up or a read. Search engines also take page experience into account, and content that is not rendered in a way the crawler can access simply does not appear in the results.
Our work starts with measurement: field data from real users, lab tests and code bundle analysis. Based on that, we prioritize the highest-impact fixes, such as images, script loading, server-side rendering and caching, and track the indicators after the changes.
Performance is not a one-off project: without follow-up, a fast site becomes slow again with every new library, image or third-party script added. That is why we leave performance budgets defined and automated checks in the pipeline that alert when a change worsens the indicators. We also make sure analytics and marketing scripts respect cookie consent and don't hurt the browsing experience.
Who it is for
Corporate and content websites
Companies that depend on organic traffic and want their pages to be found and cited.
E-commerce and marketplaces
Stores where every second of waiting can drive the customer away from checkout.
React, Next.js and Vue applications
Products built as SPAs that suffer from slow initial load or poor indexing.
Marketing and product teams
Teams that need fast pages for campaigns and a solid technical foundation for content SEO.
Problems we solve
Failing Core Web Vitals
We tackle the causes of poor LCP, INP and CLS: render-blocking resources, excessive JavaScript and shifting layouts.
Pages that don't show up on Google
We fix rendering, canonicals, sitemaps, robots, hreflang and internal links that prevent indexing.
Heavy JavaScript
We reduce the bundle with code splitting, lazy loading and removal of unnecessary dependencies.
Slow images and media
We apply modern formats, correct sizing and on-demand loading.
Content poorly understood by search engines and AI
We structure semantic HTML and structured data (Schema.org) to make clear what each page is about.
What we deliver
Performance assessment
A report with measurements, identified causes and a fix plan prioritized by impact.
Core Web Vitals optimization
Code and infrastructure fixes to improve loading, interactivity and visual stability.
Technical SEO
Per-page rendering strategy, metadata, sitemaps, canonicals, hreflang and structured data.
CDN and edge caching
Cache configuration and content delivery close to the user.
Image and asset optimization
Compression, modern formats, optimized fonts and prioritization of the main content.
Continuous monitoring
Real-user metrics collection and automated pipeline checks to prevent regressions.
Technologies and stack
We combine measurement tools with front-end and infrastructure engineering techniques:
- Lighthouse
- Web Vitals
- Next.js
- CDN
- Edge Computing
- Technical SEO
- Schema.org
- Google Search Console
How we work
Measurement
We collect field and lab data and analyze the code bundle and current indexing.
Diagnosis
We identify the causes of each problem and estimate the effort to fix them.
Prioritization
We rank actions by impact and risk, together with your team.
Implementation
We apply fixes in short cycles, validating each one in staging.
Follow-up
We monitor indicators in production and add checks to prevent regressions.
Frequently asked questions
What are Core Web Vitals?
They are Google metrics that measure the real user experience of a page: LCP (time until the main content appears), INP (how quickly the page responds to interactions) and CLS (visual stability of the layout).
Does performance affect Google rankings?
Page experience is one of the signals Google considers, alongside content relevance. In addition, fast pages tend to retain more visitors, which matters regardless of rankings.
What is the difference between technical SEO and content SEO?
Technical SEO ensures that search engines can access, render and understand pages: speed, structure, metadata and indexing. Content SEO deals with what is written. Wisalo works on the technical side and delivers the foundation for content work.
Can a React application have good SEO?
Yes, as long as it uses the right rendering strategy. With server-side rendering or static generation, for example with Next.js, content reaches both the crawler and the user ready to use.
Do you guarantee the top position on Google?
No. Nobody can guarantee search engine rankings. What we do is remove technical barriers and make the site fast and well structured, with data-driven follow-up.
Do you optimize websites that were not built by Wisalo?
Yes. We assess existing websites and applications regardless of who built them, and apply the fixes together with the responsible team or directly in the code, as agreed.
Shall we talk about your project?
Tell us the context, goals and constraints of your challenge. A Wisalo specialist will get back to you with the next steps.
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