Reader
The complete book
Read all 36 chapters without setting up a codebase.
- Polished PDF and EPUB
- Running Ledger case study
- 13 diagrams
- Appendices and indexes
- Lifetime updates
All books
STAGE 5
SwiftUI Under Load
Production SwiftUI engineering
Stage 5 · ArchitectureAvailable now
Version Launch edition 2026 · Updated 5 Aug 2026
SwiftUI Under Load: The Production SwiftUI Book
It works in development. Make it hold under load.
SwiftUI is a pleasure until the app grows. Lists stutter, stale requests win races, image decoding blocks the main thread and an overgrown model starts invalidating everything.
This book begins with failures you can reproduce, explains the mechanism underneath them, applies the smallest correction that works and then builds the design that holds under production load.
The companion material carries the Ledger case study from broken to verified across a staged repository, with code and tests you can run on an Apple toolchain.
Choose Reader, Professional, Complete or a Team license on Gumroad. Free lifetime updates are included with every edition.
36 chapters12 failure labs9 one-command test labs6 full-source apps in Complete13 diagramsLifetime updates
Prepare before you buy
Start with the free guides.
Main description
A production book, not a component reference.
The happy path is not the hard part of SwiftUI. The hard part is keeping the UI truthful and responsive while data arrives out of order, work is cancelled, identities change, images compete for memory and UIKit screens migrate behind a safe boundary.
Every performance claim is either tied to a measured source or identified as illustrative. The code, labs and staged repository are designed to make the central claims inspectable, not merely persuasive.
Choose your edition
Start with the depth you need.
Every edition includes free lifetime updates. Professional is the core code edition. Complete and Team add the material for structured adoption.
Professional
The core code edition
The book plus the complete runnable companion repository.
- Everything in Reader
- 12 failure labs
- 9 headless one-command tests
- Staged repository and git history
- Ledger iOS app and Xcode project
- Instruments trace catalog
Complete
The apps and workshop edition
Get the book, repository, six complete apps and structured workshop material.
- Everything in Professional
- 6 complete apps in full source
- Commercial license to rebrand and ship
- 6 workshop decks with answer keys
- Exercise and review workbook
- Production-ready checklist and retrospective kit
Team
Per team or per seat
Adopt the practices across an engineering team.
- Everything in Complete
- Team license
- Facilitator guides
- Manager and lead briefings
- 90-day adoption plan
Professional requires Xcode 16 or newer. Team pricing depends on team size and license scope.
What this book helps with
Everything between the app and the system around it.
SwiftUI performanceSwift 6 concurrencyLarge listsImage pipelinesScoped stateUIKit migrationTests and CI gates
A smooth demo proves the happy path.
Production proves the design.
What is inside
From where you are to the next level.
Read the failure
Stutters · Stale results · Main-thread stalls · State churn
Find the mechanism
Identity · Cancellation · Reentrancy · Recomputation
Apply the correction
Scoped state · Image work · Task ownership · Migration boundaries
Prove the result
Tests · Budgets · Instruments · CI gates
The production method
Failure to proof
- Reproduce
- Explain
- Correct
- Design
- Prove
Each idea starts with a failure you can reproduce and ends with evidence that the correction holds.
Product proof
What you can inspect before buying.
Each book page shows the method, the scope, and the kind of transformation the material is designed to create. Real reader testimonials are only shown when genuine quotes are available.
Broken, then fixed
Failure labs make the symptom visible before showing the correction and the design that lasts.
Ledger, staged
The running case study moves from baseline to production ready through a repository you can inspect one change at a time.
Tests that run
Nine labs run headlessly with one command, and the portable Swift core builds and tests on an Apple toolchain.
Claims with sources
Measured performance numbers show their source, while uncaptured device numbers stay clearly labeled as illustrative.
STAGE 5
SwiftUI Under Load
Production SwiftUI engineering
Sample chapter
Read the first pages inside the site.
Open the in-page reader to flip through the real first pages, exported straight from the book sample.
The roadmap
Where this fits
- 01Get Found
- 02Build
- 03Interview
- 04Answer Practice
- 05ArchitectureYou are here
- 06Staff Systems
- 07Build With AI
- 08Lead
- 09Architect
Before / After
Out-of-order search
Before
Every request updates the same result state when it finishes.
After
The latest user intent owns the result.
Older work is cancelled or rejected before it can overwrite the current query.
Image-heavy list
Before
The row downloads and decodes the original image on the UI path.
After
The pipeline sizes, decodes, caches and cancels deliberately.
The row receives stable, display-ready state without blocking scrolling.
Who this is for
- You already ship SwiftUI and have felt it strain as the app, data or team grew.
- You need production reasoning across performance, concurrency, state and migration, not another introduction to views and modifiers.
- You want companion code you can run, break, inspect and verify.
- You are introducing these practices across a mobile team or study group.
Not for
- You are opening SwiftUI for the first time
- You want a visual component catalog
- You only want isolated recipes without the mechanism underneath
About me
Mike Salari
Staff Mobile Engineer · Mobile Architect · Technical Author
I wrote this for intermediate and senior iOS engineers who already know how to make SwiftUI work and now need it to stay correct, responsive and maintainable under real production pressure.
- 15+ years
- Building production mobile software
- Production scale
- High-trust consumer and enterprise mobile systems
- Mentor
- Engineers helped through interviews, growth and senior-level decisions
- Ex-Cisco & Mastercard
- Plus experience across Apple, Adobe and Visa
Published author of The iOS Interview Blueprint.
Read the full storyMake the app survive what comes after launch.
Choose the edition that matches how you want to learn, then turn the failures you can reproduce into fixes you can prove.
Choose Reader, Professional, Complete or a Team license on Gumroad. Free lifetime updates are included with every edition.
FAQ
SwiftUI Under Load: questions before you buy
Who is SwiftUI Under Load for?
Intermediate and senior iOS engineers who already ship SwiftUI and need stronger production judgment across performance, concurrency, state, migration, testing and CI.
Is SwiftUI Under Load suitable for beginners?
No. It assumes you already know SwiftUI and build iOS apps. It focuses on what happens when a working app grows, slows down, races requests, accumulates state and needs a safe UIKit migration path.
Which edition includes the companion code?
Professional is the core code edition. It includes everything in Reader plus the companion repository, twelve failure labs, the staged Ledger repository, the iOS app and Xcode project, and the Instruments trace catalog. Complete and Team include all Professional material.
Which edition includes the six full-source apps?
Complete is the only individual edition with the six complete apps and the commercial license to rebrand and ship them. Team includes everything in Complete plus the team adoption material.
What is included in the Reader edition?
Reader includes all 36 chapters as PDF and EPUB, the running case study, thirteen diagrams, the appendices and indexes, and free lifetime updates. It does not include the companion repository or runnable labs.
Does the code actually run?
The companion repository is designed to build and test on an Apple toolchain. Nine of the twelve broken-then-fixed failure labs run headlessly with one command. Professional, Complete and Team require Xcode 16 or newer.
Does the purchase include future updates?
Yes. Every edition includes free lifetime updates for the edition you purchase.
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