Getting Swift to run fast is less about clever algorithms and more about how you present your code to the compiler. The Swift compiler is hungry for predictable input — patterns it can recognize, tear apart, and rebuild into something lean. I’m Yuki Tanaka, and I’ve spent a career chasing performance at the OS layer.
Swift’s compiler can be a strong partner—if you feed it code that matches its optimization model. Getting to fast, lean machine instructions isn’t a puzzle to outsmart the optimizer. It’s about stripping away ambiguity and leaning into the guarantees the language already gives you. This piece walks through concrete, no-nonsense ways to help the Swift
Swift 5.5 brought a concurrency model that actually feels like it belongs in the language. Async/await lets you reason about work that suspends and resumes without hunting through nested closures. But once you start writing real code, the sunny-day path is rarely the whole story. Things break. Networks hiccup. Payloads surprise you. This guide lays
The Case for Moving Beyond Completion Handlers If you have built or maintained a substantial iOS or macOS codebase over the past few years, you are likely familiar with the growing complexity of asynchronous programming in Swift. Nested closures, retain cycles, forgotten weak self references, and deeply indented completion handlers have been the standard tax
How to Structure a Swift Project for Long-Term Maintainability When a Swift project starts, the directory often contains a handful of files, a simple App target, and an implicit understanding among the team about where code belongs. Six months later, that same project can become a tangled web of view controllers, utility classes, and ambiguous
The Setup: What Actually Changed in February 2025 Anthropic dropped Claude 3.7 Sonnet in February 2025, and the headline feature is extended thinking mode. If you haven’t dug into this yet, here’s the stripped-down version: the model now thinks through problems step-by-step before giving you an answer, with configurable token budgets up to 128K tokens
The Quiet Revolution Nobody’s Talking About AWS dropped Aurora DSQL at re:Invent 2024, and the internet collectively shrugged. No keynote fireworks. No celebrity cameos. Just a database announcement that fundamentally changes how you should think about global consistency and multi-region architecture. That’s how you know it’s important. For fifteen years, we’ve been told to pick
The Setup: Why Code Review Got Harder (And Why That Matters) If you’ve been shipping code for more than five years, you know the unsettling feeling. Pull requests are getting larger. Complexity isn’t decreasing. Junior developers are shipping PRs with solid logic but questionable architectural decisions, and you’re staring at 47 files wondering where the
The Agent Mode Shift: What Actually Changed Let me be direct. When GitHub rolled out Copilot Agent Mode broadly in early 2025, it didn’t just add another feature to the editing toolbar. It fundamentally altered what “writing code” means in a collaborative environment. Agent Mode operates autonomously across multiple files, executes terminal commands, and iterates
The Landscape Has Shifted Faster Than Anyone Expected Three years ago, if you wanted AI-assisted coding, you basically had one choice: GitHub Copilot. It was the obvious lane, backed by Microsoft’s distribution machine and integrated into every corner of their ecosystem. Now? It’s genuinely competitive. Cursor crossed 500,000 paid subscribers by late 2025 and raised
