Guides

Short answers for when your Mac runs low on memory or disk during development. Each one gives the Terminal commands first, so you can fix it by hand.

• Kill the process on port 3000 on a Mac

  Find what's listening on port 3000 with lsof, stop it with kill, and what to do when it comes straight back.

• iOS Simulator using too much memory

  Find every booted simulator, including the ones with no window, and shut them down with xcrun simctl.

• Gradle daemon memory on a Mac

  See how much RAM the Gradle and Kotlin daemons hold, stop them, and cap them in gradle.properties.

• Delete old simulator runtimes in Xcode

  List simulator runtimes with xcrun simctl, delete the ones you don't use, and clear the rest of Xcode's leftovers.

• Android emulator slow on a 16 GB Mac

  Why the emulator crawls on 16 GB, and the image, RAM and daemon settings that make it usable.