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VS Code uses 13% CPU when focused and idle, draining battery. This is likely due to the blinking cursor rendering. I think CPU usage when focused-and-idle could ideally be near-0%.
I recorded a Timeline in the Developer Tools, and a cursory look suggests that the CPU activity comes from rendering the blinking cursor every 500ms.
Other macOS applications like Chrome or TextEdit show a blinking cursor without consuming much CPU, so I think this could surely be optimized away.
A workaround for folks who are similarly obsessed about battery life: Disabling cursor blinking will make CPU usage drop to 0. Here's the setting:
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