Turbo Mode is a feature in Scratch that speeds up the execution of code by eliminating the short pause after running blocks that update the screen. It makes the project run as fast as possible to keep the system from lagging. To activate Turbo Mode, you can hold the Shift key and click on the green flag on your Scratch interface. You can repeat this option to switch it off. Another way to turn on Turbo Mode is to press See Inside and then press Edit, then "Turn on Turbo Mode". When using Turbo Mode, the visible resources are switched to the code execution in both online and offline modes. The computer runs it when it’s in offline mode, and the Scratch editor runs it when it’s online.

Turbo Mode can be used to speed up Scratch projects that would run slow normally, such as pen projects, 3D engines, and drawing games. However, it can make certain Scratch projects that rely on wait for timing not work properly or run too fast, though this isnt the case with most projects. It is not recommended for projects that require precise timing or have timed elements, such as pen art projects.

In summary, Turbo Mode is a Scratch feature that speeds up the execution of code by eliminating the short pause after running blocks that update the screen. It can be activated by holding the Shift key and clicking on the green flag or by selecting "Turn on Turbo Mode" in the Edit menu. Turbo Mode can be used to speed up Scratch projects, but it is not recommended for projects that require precise timing or have timed elements.