Shrinking the Binary

"Tauri already won the big size battle for you by not shipping Chromium. The rest is fine-tuning a binary that's tiny to begin with."

The Biggest Win Is Already Free

Keep perspective: the reason a Tauri app is megabytes instead of hundreds is that it doesn't bundle a browser engine. That structural decision is the 95% win, and you got it for free by choosing Tauri. Everything below is squeezing the last bit out of an already-small binary — worth doing for a polished release, but don't mistake it for the main event.

The Cargo Release Profile

The biggest remaining lever is the Rust [profile.release] in Cargo.toml. Turning on link-time optimization (lto = true), reducing codegen units to one (slower compile, smaller/faster output), stripping symbols (strip = true), optimizing for size (opt-level = "s" or "z"), and aborting on panic (panic = "abort") together can meaningfully shrink the binary. These trade compile time for a leaner release — fine, since you build releases rarely.

Don't Forget the Frontend

Your bundled web assets count toward app size too. The same frontend discipline from your web work applies: let Vite tree-shake and code-split, drop unused dependencies, compress images, and ship only what the app uses. And keep the deny-by-default plugin habit — every plugin and feature you pull in adds to the binary, so the lean capabilities file you maintained for security doubles as a size benefit. Tight grants, tight binary.

Code

Release profile tuning·toml

# src-tauri/Cargo.toml — squeeze the release binary.
[profile.release]
opt-level = "s"        # optimize for size ("z" is even smaller)
lto = true             # link-time optimization across crates
codegen-units = 1      # slower compile, smaller + faster binary
strip = true           # remove debug symbols
panic = "abort"        # no unwinding machinery in the binary

Exercise

Record your current release bundle size, then add the [profile.release] tweaks above and rebuild. Compare the new size. Try opt-level 's' vs 'z' and note which wins for your app. Then look at your frontend bundle and find one unused dependency you could drop. You're practicing measured optimization on a binary that was already small by design.

Hint

Build release first for a baseline, apply the profile, rebuild, compare. 'z' optimizes harder for size but can be slower at runtime; measure both. For the frontend, your bundler's analyze output shows what's taking space.