Abnormal battery usage - how to diagnose?

**iOS device model, version and app version**

Model Name: iPhone 15 Pro Max
Software Version: 17.2.1
App version: 2025.2 (2025.1178)

**Home Assistant Core Version**
2025.7.3

**Describe the bug**
iPhone heats up significantly when idle at front page for ~10 min, with significant battery usage

**To Reproduce**
Leave on Home

**Expected behavior**
Visible portion is updated at default frequency. Invisible portion is lazy loaded. Low CPU usage.

**Question**
I'm not sure if this is a bug or just something about my configuration (sensor number, sampling rate, etc.), since this doesn't occur when I started using HA (can't remember when this happens). What are some steps I can take to analyze what is taking CPU? For example, is it rendering a specific graph or pulling specific data too frequently?

Additional note: on macOS (m1) the HA app from App Store is also taking 100% cpu (unix style), so potentially not an issue with my iPhone.