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Performance optimization: Throttle scroll handler, async fonts, and lazy load images #105

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Performance optimization: Throttle scroll handler, async fonts, and lazy load images #105

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ece36e4
Initial plan
Copilot Oct 24, 2025
979dc2c
Optimize scroll handler, fonts loading, and image lazy loading
Copilot Oct 24, 2025
c67e8da
Modernize throttle function to use rest parameters
Copilot Oct 24, 2025
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6 changes: 3 additions & 3 deletions _includes/head.html
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Expand Up @@ -18,11 +18,11 @@
<meta property="og:image:height" content="600" />
<meta property="og:site_name" content="{{ site.url }}" />

<link rel="preload" as="style" href="{{ " /assets/css/style.css" | relative_url }}">
<link rel="stylesheet" href="{{ " /assets/css/style.css" | relative_url }}">
<link rel="preconnect" href="https://fonts.gstatic.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link rel="preload" as="style" href='https://fonts.googleapis.com/css2?family=EB+Garamond&display=swap'>
<link href="https://fonts.googleapis.com/css2?family=EB+Garamond&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/css2?family=EB+Garamond&display=swap" rel="stylesheet" media="print" onload="this.media='all'">
<noscript><link href="https://fonts.googleapis.com/css2?family=EB+Garamond&display=swap" rel="stylesheet"></noscript>
<link
href="data:image/x-icon;base64,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"
rel="icon" type="image/x-icon" />
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8 changes: 4 additions & 4 deletions _includes/home-work.html
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Expand Up @@ -14,13 +14,13 @@ <h3>Lead & Design Manager (2018 – 2020)</h3>
<figure class="home-work-grid__project-screenshot"><img src="{{"
/assets/work/pipelines/pipelines-01.png " | relative_url }}" width="1200px" height="440px"
alt="Adrián Mato - Azure Pipelines"></figure>
<figure class="home-work-grid__project-screenshot"><img src="{{"
<figure class="home-work-grid__project-screenshot"><img loading="lazy" src="{{"
/assets/work/pipelines/pipelines-02.png " | relative_url }}" width="1400px" height="875px"
alt="Adrián Mato - Azure Pipelines"></figure>
<figure class="home-work-grid__project-screenshot"><img src="{{"
<figure class="home-work-grid__project-screenshot"><img loading="lazy" src="{{"
/assets/work/pipelines/pipelines-04.png " | relative_url }}" width="1400px" height="875px"
alt="Adrián Mato - Azure Pipelines"></figure>
<figure class="home-work-grid__project-screenshot"><img src="{{"
<figure class="home-work-grid__project-screenshot"><img loading="lazy" src="{{"
/assets/work/pipelines/pipelines-03.png " | relative_url }}" width="1400px" height="875px"
alt="Adrián Mato - Azure Pipelines"></figure>
</div>
Expand All @@ -35,7 +35,7 @@ <h3>Sr. Product Designer (2015 – 2018)</h3>
and more available on mobile, tablet and desktop.
</p>
</div>
<figure class="home-work-grid__project-screenshot"><img src="{{"
<figure class="home-work-grid__project-screenshot"><img loading="lazy" src="{{"
/assets/work/yammer/yammer-01.webp " | relative_url }}" width="1200px" height="590px"
alt="Adrián Mato - Yammer Office 365"></figure>
<figure class="home-work-grid__project-screenshot"><img loading="lazy" class="h-bradius" src="{{"
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21 changes: 17 additions & 4 deletions assets/js/s.js
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Expand Up @@ -19,19 +19,32 @@
}
}

// scrolling event
document.addEventListener("scroll", scrollHandler);
// throttle function to limit scroll handler execution
function throttle(func, limit) {
let inThrottle;
return function(...args) {
if (!inThrottle) {
func.apply(this, args);
inThrottle = true;
setTimeout(() => inThrottle = false, limit);
}
}
}

// scrolling event with throttling
function scrollHandler() {
// scroll hint
let scroll = document.scrollingElement.scrollTop;
// cache scroll value to avoid repeated DOM access
const scroll = document.scrollingElement.scrollTop;

// hide arrow when needed
if (scroll >= arrowTreshold && arrow) {
arrow.classList.remove("visible");
}
}

// throttle scroll handler to run at most every 100ms
document.addEventListener("scroll", throttle(scrollHandler, 100));

// initialize scroll hint
showScrollHint(3);
}
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