Power and Battery Life

The efficiency of an API can be measured by its impact on battery life, which is related to the thermal budget but separate. Every processor operation not only generates heat, but also requires electrical current. Therefore, mobile devices are limited by how much energy can be supplied to the chip and the amount of energy stored on the device (the battery capacity).

A limitation that influences these factors is that mobile devices have limited space for power lines and this space decreases as more processors are added. Also, the battery of a mobile device is often one of the largest components (next to the screen and casing) and battery life is a key element of a mobile device's saleability.

Vulkan's efficiency reduces the current drawn from mobile devices. This effect is expected to become more apparent as more applications and components move to using Vulkan exclusively, which would lead to the battery life of devices improving as well.