Caliper 0.1.1

A performance release. Caliper cost the most in the one state you were most
likely to be looking at it — a panel open, which is the only way to read its
own figure. That is fixed, and the claim it makes about itself is now specific
about which state it describes.

What changed

• A panel only samples what it shows. Cadence used to be decided by how
  much of the app was open, so opening any panel pulled the temperature sweep
  from one reading every thirty seconds to one every two — including on the
  four panels that draw no temperature at all. That sweep is the most expensive
  reading Caliper takes, by an order of magnitude. Each surface now asks for
  the metrics it actually draws and nothing else.
• The menu bar stopped repeating itself. The strip was handing the window
  server a new label, tooltip and width on every refresh whether or not any of
  them had changed, and a module with nothing to show — a Mac that reports no
  sensors — was being re-hidden twice a second for the life of the session.
• The disk image is an installer now. It opens with Caliper and the
  Applications folder side by side, so the instruction to drag one onto the
  other is finally something you can follow — until now the image held the app
  and nothing else, and you had to go and find Applications yourself.
• On this Mac, with the default strip: 0.68 % of one core with the menu bar
  alone, down from 0.78 %, and 2.1 % with the CPU panel open, down from 3.2 %.
  Closing a panel now returns to where it started instead of settling at twice
  it.

About that number

"Under 1 %" is the steady state — menu bar up, nothing open — and it was never
a claim about anything else. Since the only way to see Caliper's own reading is
to open a panel, the expensive state is the one everybody meets, so the figures
above name which is which. They are shares of one core, the unit Activity
Monitor's %CPU column uses, not of the whole machine.

Requirements

macOS 15 or later, Apple Silicon. Sensors are read on a best-effort basis: what
a particular Mac will not report is hidden rather than guessed at.