# Advanced Scenario Settings

Scenarios have several advanced running settings that allow you to optimize its performance and functionality. Here are these settings:

![](/files/-MU31lRnKlqPCoqHOtu6)

### Single-threading mode

Under the single-threading mode, the scenario processes only one object at a time. This means that if there are other objects in the queue at the Start step, they will wait until the currently processed object exits the scenario.

### Saving exceptions

If the option is ON, the scenario will create objects in the `SystemException` [system data structure](/data/data-structures/system-structures.md) when something goes wrong.

### Lock

The Lock option provides a method to prevent collisions when writing to a single field on an object. By default, this option is turned off to optimize processing speed.


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