A background work-memory app should stay out of your way
Why idle memory, CPU use, startup time, and storage growth matter for an app that records work in the background on Windows and macOS.
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Always-on value has an always-on cost
Work memory is most useful when it can recover an ordinary workday, including the moments you did not think to document. That means its desktop app may run beside a browser, editor, chat app, and build tools. If it slows down those tools, the memory feature loses its value.
The original Japanese article described the performance targets for the first Windows implementation. Contextberg now also has a macOS app. The design principle applies to both, but historical targets from one platform should not be presented as measured performance of the current apps.
Measure the cost a person actually feels
| Measure | Why it matters |
|---|---|
| Idle memory | The app remains resident while you do other work |
| CPU while recording | Capture should not interrupt typing, navigation, or builds |
| Startup time | A slow launch makes daily use and automatic startup less reliable |
| Disk growth | Screens and logs accumulate over time |
| Cost while paused | A privacy control should not leave unnecessary capture work running |
Measure these under realistic workloads and over time. A single idle snapshot does not tell you what happens during screen capture, memory generation, or a long work session. Report platform, build, machine, capture settings, and sample period with any published number.
OS-native behavior is part of the design
Recording depends on operating-system permissions and APIs. Windows and macOS do not have identical capture or permission models, so the implementation should respect each platform's boundary and explain what is being recorded. Performance and trust meet here: a quiet background app needs clear controls as much as efficient code.
Contextberg's practical promise is to keep Record, Memory, and Chat available without making the computer feel occupied by the recorder. The right test is not a framework comparison; it is whether the app remains predictable during the user's real work.