How to Log Metal Performance on iOS 27

Enable the Metal HUD and graphics performance logging on iOS 27 for development app performance investigations.

Step 1

Open Settings from the Home Screen

iPhone Home Screen with the Settings app in the third row — Tap the gray Settings icon on your Home Screen.

Before you begin: An unlocked iPhone running iOS 27, paired with Xcode, with Developer Mode enabled and Developer visible in Settings.

Find and tap the Settings app on your Home Screen. Its icon looks like a gray gear.

Step 2

Open Developer in Settings

Settings showing the Developer menu — Tap Developer in Settings.

In Settings, scroll down and tap Developer.

Step 3

Open Metal HUD

Developer settings showing Metal HUD — Tap Metal HUD.

Scroll to Metal HUD.

Step 4

Enable the Metal HUD first

Metal HUD settings showing Show Metal Performance HUD — Turn on Show Metal Performance HUD.

Turn Show Metal Performance HUD on so your development app can display its overlay. The device indicates that enabling or disabling it requires a restart.

Step 5

Turn on Log Metal Performance

Metal HUD settings showing Log Metal Performance — Turn on Log Metal Performance.

With the HUD enabled, turn Log Metal Performance on. Run your development app to collect graphics performance logging, then inspect the logs using your Mac.

Turn logging off after the test. Enabling logging does not itself export a log file.

Reference

By ProgramGuru

Published: 2026-10-14

Updated: 2026-10-14

Instructions reviewed against Apple documentation on 2026-10-14.

Apple: iPhone settings guide