News
Meet the Sim Farm.
Many slim iOS sims on one Mac, built for Buoy Optimize. Each speed idea gets its own sim. Each sim acts like a real iPhone SE. It's free with a Buoy account.
Use buoy optimize and the sim farm on our slow feed screen.
That's all you ask. You don't pick how many ideas.
Updated October 14, 2026 · by the Buoy team
⅓
the memory of a normal sim
3×
faster to start
4 s
to make a new sim
A slim sim next to a normal one, on our test Mac. See the numbers.
How it works
Many sims look. One sim times.
Buoy Optimize tries many ideas to make a slow screen faster. The farm gives each idea its own sim, so your AI checks them all at once.
1
Ideas
Your AI writes down every way it can find to make it faster. That is at least 20 ideas.
2
Build
It builds the most likely ones first. Each one is its own version of the screen.
3
Look
Each idea gets its own sim. The AI takes a picture of each. An idea that crashes or looks wrong is out.
4
Memory
Each sim acts like an iPhone SE. An idea that uses too much memory is out too.
5
Speed
The ideas left get timed on one quiet sim. The old code is timed in every batch too.
6
Again
It keeps what won, mixes the best and tries new ones. It stops when it can't get faster, or time runs out.
Why one sim for speed? All sims share the Mac's CPU. Ten sims timed at once would slow each other down. If the Mac gets too busy, the farm marks the run unfair, and the AI runs it again.
Why slim
More sims fit on your Mac.
A normal sim uses about 5 GB. Most Macs can only run a few. Slim sims turn off phone services a test doesn't need.
| Normal sim | Slim sim | |
|---|---|---|
| Memory | 4.7 to 5.8 GB | 1.4 to 1.6 GB |
| Programs running | 210 to 257 | 77 to 84 |
| Start time | 39 s | 12 s |
Ten slim sims started at once took 94 s and used 15.4 GB in all. Slim sims have no push, purchases, app links, widgets or Spotlight. If a test needs one, the AI can make a normal sim instead.
Acts like a real phone
Fast on a sim. Closed on a phone.
A sim app can use all of your Mac's memory. In our test, one app grew to 20 GB. A real iPhone SE closes an app at about 2.1 GB. So an idea can look fast only because it uses too much.
2,957 MB
the memory the app sees, like the phone
6 cores
the same as the phone
2,098 MB
where a real phone would close the app
So the farm starts each app as an iPhone SE (2nd generation). Your AI sees when a real phone would have closed it. We checked these numbers on a real iPhone SE. Got a different phone? Plug it in and run farm phone measure.
How to start
Set it up once. Then ask.
Run this in your app's folder. It sets up Buoy MCP and the buoy-optimize skill.
$ npx -y @buoy-gg/mcp@latest init
1
Add Bench
Add
@buoy-gg/perf-monitor. Optimize uses it to time each idea.2
Build for the sim
Make a development build. The farm needs the .app file.
3
Ask your AI
Name your slow screen or component. The AI does the rest.
You need a Mac with Xcode. Watch it all live in Buoy Desktop's Sims panel. The Sim Farm guide has each step.
Questions