At PerfReviews, we analyze the performance of websites. It's an ideal way to teach how to use tools to detect, fix, and prevent performance issues.
We are recognized Google Developer Experts in web technologies and have extensive experience developing websites with a special focus on usability, accessibility, and performance.
Since websites are dynamic projects, the reviews may mention aspects that are no longer reproducible. Therefore, we accompany the videos with a series of reports that allow you to visualize a 'snapshot' of the website at the time of the study.
We reviewed the El Corte Inglés website and found many requests for images that are not displayed, large JS and CSS files of which only a minimal part is used, and other issues.
12/31/2018
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Analizamos el rendimiento de las webs de partidos políticos ante las elecciones generales de España 2019.
4/18/2019
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We analyzed the website of the e-learning platform Escuela IT. We'll explore unminified statics, avoidable reflows, and opportunities to improve font loading.
4/14/2019
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In our first analysis, we reviewed the new Mediamarkt Spain website. We found issues with caching, lack of compression, multiple versions of jQuery, and more.
12/28/2018
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We analyzed the Renfe website. We found issues with unminified static files, asset duplication, manual resource combination, and repaint problems caused by tracking libraries.
2/26/2019
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We analyzed the Smashing Magazine website looking for techniques to deliver pages with good performance and found them. Service worker, preload/preconnect to speed up resource loading, critical CSS with lazy loading for the rest of the CSS, non-blocking font loading... It's the best website we've reviewed so far.
1/28/2019
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We analyzed the Zara website and found good performance techniques but also room for improvement. Large images scaled down, optimizable SVGs, blocking Optimizely...
1/7/2019
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