Increasing keystroke latency was discussed on HN before: https://news.ycombinator.com/item?id=15485672

>I would argue that multitasking, camera postprocessing, widgets, background app refresh, and others are all features worthy of more resource usage. Many of those are things you can choose not to use if you want to save power.

For all those features turned off (before and after), the usage increases with each version.