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Native Swift Means Your AI Agent Launches Instantly

Fazm Team··2 min read
swiftnativeperformancelaunch-speedelectron

Launch Speed Is a Feature

You press a hotkey to summon your AI agent. If it takes 3 seconds to appear, you've already lost momentum. Your thought has moved on. The friction is small but constant, and it compounds across dozens of activations per day.

Native Swift apps on macOS launch in under a second - often under 300 milliseconds. The window appears instantly because the binary is compiled ahead of time, the frameworks are already in memory, and there's no JavaScript runtime to bootstrap.

The Electron Tax

Electron apps bundle an entire Chromium browser. When you launch one, it needs to start that browser, load the JavaScript, render the HTML, and initialize the application state. On a fast Mac, that's 2-4 seconds. On one with limited memory, it's worse.

For a text editor or a project management tool, this startup cost is tolerable because you launch it once and keep it open all day. For an AI agent that you summon and dismiss repeatedly - press hotkey, give a command, let it work, dismiss, summon again five minutes later - the startup cost hits you every time.

Beyond Launch Speed

Native Swift isn't just about startup time. It also means lower memory usage (no Chromium instance running), better battery life, smoother animations, and access to macOS APIs that Electron apps can't easily reach.

The accessibility API integration is particularly important. Swift apps can use NSAccessibility natively, reading and interacting with other applications through the same framework the OS uses. Electron apps need to bridge through Node.js bindings, adding latency and fragility.

Building for the Hotkey Workflow

An AI agent designed for hotkey activation needs to be either always running in the background with minimal footprint, or able to cold-start fast enough that you don't notice. Native Swift handles both cases well. The menu bar app pattern - a lightweight process that's always alive but barely uses resources until activated - is a natural fit for an agent you want available at all times.

Fazm is an open source macOS AI agent. Open source on GitHub.

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