Home/Courses/Svelte/Under the Hood & Performance

Under the Hood & Performance🏎️

Advanced

Svelte 5

Understand how the Svelte 5 compiler works, why it's so fast, and how to optimize your apps for maximum speed. Master fine-grained reactivity and memory management.

5

Sections

15

Lessons

15

Challenges

Start this free course

Start learning Under the Hood & Performance

15 lessons and 15 challenges, all 100% free.

Start this course

How Compilation Works

What the Compiler Outputs

How Runes Are Compiled

Compiler Output(Sign in required)

Beginner+10 Mana

Rune Nature(Sign in required)

Intermediate+15 Mana

Bundle Size Advantage(Sign in required)

Intermediate+15 Mana

Signals vs Virtual DOM

Automatic Dependency Tracking

Update Batching

Update Complexity(Sign in required)

Intermediate+15 Mana

Batching Result(Sign in required)

Intermediate+15 Mana

Waiting for DOM Updates(Sign in required)

Intermediate+15 Mana

Memoization with $derived

Keyed Each Blocks

Lazy Loading Components

Optimize Expensive Work(Sign in required)

Intermediate+15 Mana

Add Keys to List(Sign in required)

Intermediate+15 Mana

Lazy Component Loading(Sign in required)

Intermediate+15 Mana

Cleaning Up Effects

Avoiding Unnecessary Tracking

Handling Large Data Structures

Spot the Memory Leak(Sign in required)

Intermediate+15 Mana

Cleanup Pattern(Sign in required)

Intermediate+15 Mana

Non-Reactive Large Data(Sign in required)

Intermediate+15 Mana

Understanding Virtualization

Implementing a Virtual List

Infinite Scroll Pattern

Virtualization Benefit(Sign in required)

Beginner+10 Mana

Calculate Visible Items(Sign in required)

Intermediate+15 Mana

Infinite Scroll Trigger(Sign in required)

Intermediate+15 Mana

Ready to start this free course?

No credit card required.

Start this course now

Ready to start Under the Hood & Performance?

15 interactive lessons and 15 hands-on challenges — learn in VS Code, Cursor, or the web.