Last Sunday, I delivered two presentations at TEOConf 2025: "Creating Social Value with Rust and Breaking Platform Barriers" and "Zero Runtime CSS in JS, Devup UI." Preparing two talks in a single day was honestly challenging, both physically and mentally.

The two presentations were fundamentally different in their themes. The first talk explored how Rust as a language can create social value and overcome technical platform barriers. I approached it from the perspective that technology isn't merely about efficiency or performance, but can bring real change to people's lives. The second presentation focused on the technical features of Devup UI and the performance advantages of Zero Runtime CSS in JS. Despite being delivered by the same speaker on the same day, the two sessions had distinctly different characters.

What was interesting was that the presentation styles naturally evolved differently as well. In the first talk, I centered the narrative around the social impact created by technology and the considerations throughout that process. In the second, I built the presentation around benchmark numbers and specific technical implementation details. While I hadn't intentionally designed an A/B test, that's essentially what it became.

And the responses to the two sessions were different. Some audience members resonated more with the value-centered approach of the first presentation, while others showed greater interest in the clear technical proof of the second. During the Q&A sessions following each talk, the nature of the questions was markedly different. Though delivered by the same speaker on the same day, the points that engaged the audience were completely distinct.

This experience reinforced an important realization: not only does what you say matter, but how you deliver it significantly influences the effectiveness of a presentation. The same content can be received entirely differently by an audience depending on the context, structure, and flow of delivery. Technical presentations don't necessarily need to emphasize only numbers and performance, nor do value-centered talks need to lack specificity. What matters is deeply considering who the audience is, what they expect, and within that context, which delivery method will be most effective.

Thanks to this experience, I've realized that when preparing future presentations, I need to go beyond simply filling content and first design the structure and flow by deeply considering the audience and context. TEOConf 2025 wasn't just a venue where I completed two presentations—it was a valuable learning experience that allowed me to grow as a speaker.

For my next presentation, I want to create a talk that communicates more effectively based on this experience.

My sincere thanks to everyone who participated.