Use CompareTag (PERF_004)

Using the direct .tag == "string" comparison in Unity is a common but subtle performance trap.

The Problem

When you access gameObject.tag, Unity creates a new string copy of the tag from the native side to return it to the managed C# side. If you do this inside a collision check or an Update() loop, you are generating “Garbage” (memory allocations) every single time that line runs.

if (other.gameObject.tag == "Player") // ❌ Allocates a new string!
{
    // ...
}

The Solution

Unity provides a built-in method called .CompareTag() which performs the check on the native side without allocating a new string on the C# side.

if (other.gameObject.CompareTag("Player")) // ✅ Zero allocations
{
    // ...
}

Auto-Fix

Code Hygienist Pro automatically detects these comparisons and refactors them to use .CompareTag(). It correctly identifies the object prefix (e.g., collision.gameObject or just this) to ensure the refactor is syntactically perfect.