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World Congress 2023 • Aug 11, 2023

Qwik: Making sure that easy is same as performant

Miško Hevery

Tired of client-side hydration ruining web performance? Qwik flips the rendering model upside down with resumability so you can ship zero-latency applications without sacrificing developer experience.

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#1 about 8 min

Event welcome and introduction to the Builder ecosystem

Framework-agnostic open source tools enable developers to deploy third-party scripts and design components across platforms.

#2 about 3 min

Addressing failing core web vitals and heavy bundles

Increasing interactivity requires shipping more code to the frontend without overwhelming the initial browser startup phase.

#3 about 4 min

Challenges with hydration and the uncanny valley of interactions

Re-executing massive component trees forces users to wait idly while missing early click interactions.

#4 about 3 min

Using resumability to eliminate duplicate state and reconciliation overhead

Encoding event listeners directly into HTML bypasses heavy client-side rendering for constant baseline performance.

#5 about 3 min

Automating performance optimizations through signals and code extraction

Advanced compilers use signals and extraction patterns to invert execution logic and guarantee small initial payloads.

#6 about 2 min

Demonstrating lazy loading and code extraction in framework components

Delaying network requests until explicit user interaction prevents unnecessary function execution during the initial page load.

#7 about 3 min

Prefetching code and automating application bundling using service workers

Background caching of necessary application chunks ensures rapid script execution even on dropped network connections.

#8 about 2 min

Teleporting closures between the client and server execution environments

Wrapping stateful closures dynamically delegates logic to server endpoints while automatically recovering required application variables.

#9 about 2 min

Optimizing state payloads with selective serialization and server loaders

Efficiently transferring logic requires precise configuration rules to strip unused data scopes out of serialized payloads.

#10 about 2 min

Preventing cumulative layout shifts natively with optimized image components

Specialized asset components automatically inject structural dimensions and varied source sets to stabilize visual load behaviors.

#11 about 4 min

Handling server secrets and fallback strategies for service workers

Differentiating public variables from private environment values prevents accidental leakage of backend keys to client browsers.

Matching moments

1:34 min

Introducing the Qwik open source web framework

Misko Hevery · WWC 2021

2:08 min

Demonstration of Qwik deferred code execution capabilities

Misko Hevery · WWC 2021

3:02 min

Modernizing legacy client-rendered components with server-side frameworks

Igor Minar Igor Minar +1 · WWC 2025

3:06 min

Audience Q&A on framework limitations and specific uses

Simon Auer Simon Auer · WWC 2022

3:52 min

Optimizing browser performance using modern island architecture

Florian Rappl · LIVE

4:50 min

Balancing interactivity and load times with pre-rendering

Andreas Taranetz Andreas Taranetz · WWC 2024

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