Hugo JS Optimization: Bundling, Fingerprinting, and Caching in 15 Minutes

Tue, 27 Jan 2026 00:00:00 +0000

Introduction

After cleaning up CSS styles and optimizing images, I focused on the JavaScript layer. At first glance, the situation looked innocent. The site was loading two files: a script from the theme and my own code for handling the color theme toggle. Together, they weighed less than three kilobytes. With such a small size, optimizing here might seem like overkill.

However, the real challenge was hidden in the HTTP headers. I noticed that both files had a one-year cache lifetime. Unfortunately, their names lacked a unique identifier, or a “fingerprint.” This created a serious risk. It meant that after deploying any fixes, users would still use the old version of the code saved in their browsers.

CSS Optimization in Hugo: Minification and Bundling for Maximum Performance

Tue, 13 Jan 2026 00:00:00 +0000

Introduction

We often focus on optimizing JavaScript or images, while treating CSS styles as somewhat secondary. We assume that since individual files weigh just a few kilobytes, they’re not a problem. But that’s a false assumption. The way we deliver these files to the browser can have a crucial impact on how quickly users see the finished page.

When I looked into Chrome’s developer tools, I noticed a specific problem on my site. My page was loading fifteen separate CSS files. Combined, this generated a delay of around one point six seconds. Interestingly, the data size wasn’t the issue at all. GZIP compression was working correctly and reducing file weight by over sixty percent. The real bottleneck turned out to be the sheer number of HTTP requests. The browser was wasting time establishing connections instead of downloading content.

Bundling on Kliku Kliku

Hugo JS Optimization: Bundling, Fingerprinting, and Caching in 15 Minutes

Introduction

CSS Optimization in Hugo: Minification and Bundling for Maximum Performance

Introduction