Disabling Unnecessary Background Daemons to Run More iOS Simulators on a Mac

Description and use

Disabling unnecessary background daemons allows more iOS simulators to run on a Mac, improving testing performance.

Problem

Running multiple iOS simulators on a Mac is limited by background daemons that consume resources, preventing efficient parallel simulation.

Outcome

By disabling unnecessary background daemons, developers can run more iOS simulators concurrently, improving testing throughput and reducing wait times.

Workflow

• Identify resource‑intensive background daemons using Activity Monitor or top
• Create a script or use simslim to disable selected daemons
• Restart the Mac or reload services
• Launch iOS simulators and monitor resource usage
• Re‑enable daemons when not needed
• Document the configuration for future use

Evidence

Disables unnecessary background daemons to run more iOS simulators on a Mac.

Source