/optimize

Suggests ways to make the selected code run faster.

Where you type it

In the GitHub Copilot Chat box in your code editor.

Before you start: GitHub Copilot extension signed in, in VS Code, Visual Studio, JetBrains or Xcode. This is GitHub Copilot, not Microsoft Copilot.

Add

Select the code.

Example

/optimize

Works in

Visual Studio

The list changes by editor and over time. Type / in Copilot Chat to see what yours offers. A real command built into Copilot, checked against its own help pages in November 2026. Official help page