Any way to reduce CPU usage?

### 🚀 The feature, motivation and pitch

The CPU usage of my terminal jumps to ~10% when the timer is counting down?
That feels high... curious if you see that as well and whether you've considered any ways to reduce?

### Alternatives

_No response_

### Additional context

_No response_

The issue does not name a file, test, or entry point. Start by reproducing the reported roughly 10% CPU usage while the timer counts down, then locate the timer implementation and measure a change against the baseline. Done means demonstrably lower CPU usage without breaking the countdown.

Written by the indexing model from the issue text.