What feature of iOS helps improve battery performance?

Low Power Mode is a feature in iOS designed to extend the device's battery life by reducing background activity and minimizing power consumption. When activated, it temporarily disables or limits certain functions, such as mail fetch, background app refresh, visual effects, automatic downloads, and certain animations. This allows the device to conserve energy during times when the battery is running low, making it an effective tool for users who want to prolong their usage time between charges.

The other options, while related to device usage and performance, don't directly provide the same level of battery conservation. For instance, Night Shift adjusts the color temperature of the display to reduce blue light exposure at night, primarily for eye comfort rather than battery life. Battery Optimization generally refers to various strategies built into iOS to manage battery usage over time, but it does not refer to a specific mode that users can activate for immediate effects. App Throttling might relate to limiting resource-intensive activities of apps, but it does not offer the comprehensive, user-activated battery conservation that Low Power Mode does.