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World Congress 2023 • Nov 10, 2023

The Illusion of a Performant Web Application

Cathrin Möller

Chasing perfect performance metrics is a costly trap. Discover how clever UX tricks and optimistic UI create the illusion of blazing-fast web apps without rewriting legacy backend code.

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#1 about 4 min

Human perception of application load times

How human tolerance for wait times dictates the psychological perception of application speed.

#2 about 4 min

Bundle sizes and frontend framework choices

Understanding how monolithic architecture decisions and massive javascript bundles impact initial loading times.

#3 about 4 min

Debugging performance bottlenecks with developer tools

Identifying blocking resources using lighthouse tools without over-optimizing for flawless laboratory metrics.

#4 about 2 min

Preventing layout shifts in modular architectures

Using minimum viewport heights to eliminate jarring visual jumps during asynchronous content rendering.

#5 about 7 min

Implementing shimmer animations for initial loads

Replacing blank screens with animated skeleton loaders to vastly improve perceived initial load speed.

#6 about 7 min

Resolving JavaScript blocks during application bootstrapping

Bypassing synchronous runtime configuration and initialization bottlenecks to prevent javascript thread locking.

#7 about 4 min

Enhancing runtime performance through interface interactions

Masking slow backend network responses through interface transitions and optimistic data updates.

#8 about 2 min

Balancing performance scores and user experience

Prioritizing the actual subjective experience of loading states over chasing flawless technical performance metrics.

Matching moments

4:52 min

Evaluating performance impacts of advanced CSS animations

Aaron T. Grogg · Coffee With Developers

3:19 min

Navigating browser constraints through web animation performance tier lists

Chris Heilmann +2 · LIVE

1:35 min

Understanding user dissatisfaction with web application performance

Nicolas Frizzarin Nicolas Frizzarin · World Congress 2024

3:09 min

Building an application shell to improve perceived loading performance

Rowdy Rabouw Rowdy Rabouw · World Congress 2021

59 sec

Applying quick performance wins to personal websites

Chris Heilmann · LIVE

3:52 min

Optimizing browser performance using modern island architecture

Florian Rappl · LIVE

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Upcoming sessions on this topic

Open session

World Congress 2026 North America

September 24, 2026 · 14:50–15:20

Stage 9

How to generate business value through performance optimizations

Nikolai Sidiropulo

Software Engineer at Meta

Nikolai Sidiropulo
Open session

World Congress 2026 North America

September 24, 2026 · 12:50–13:20

Stage 7

Architecting Agentic Apps: WebMCP, A2UI, and Agent Experience

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Sr. Principal Engineer @ Secureworks | Angular GDE

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Open session

World Congress 2026 North America

September 25, 2026 · 15:30–16:00

Stage 6

Small LLM in your Browser: Huge Opportunities for Web Applications

Daniel Ostrovsky

UI/UX Architect at Payoneer | AI Architect | Full Cycle Development Expert | Public Speaker | Open Source Contributor |

Daniel Ostrovsky
Open session

World Congress 2026 North America

September 25, 2026 · 14:10–14:40

Stage 7

Why Your iOS App Feels Broken After an Hour: Diagnosing Long-Session Performance on Real Devices

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Staff Performance Engineer at ServiceNow

Vasuki Uday Kiran Vudathala
Open session

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September 25, 2026 · 16:50–17:20

Stage 4

Engineering Moneyball: How We Benchmarked Google vs Meta

Jirka Bachel

Co-Founder & CEO

Jirka Bachel
Open session

World Congress 2026 North America

September 24, 2026 · 14:10–14:40

Stage 7

Designing High-Performance AI APIs: Lessons from Serving Millions of Real-Time Requests

Wayne Liu

Chief Growth Officer and Americas President of Perfect Corp.

Wayne Liu

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