Hi Stephen Plunkett,
The sign-in times you're seeing may not necessarily indicate that anything is wrong with your PC. Utilities such as Wise Care 365 typically estimate sign-in performance based on their own measurement methods, and the reported value can vary depending on what Windows is doing in the background during startup.
A reported time of 0 seconds is often a measurement artifact rather than a literal sign-in duration, while a startup taking 23-25 seconds can still be within a normal range, especially if Windows is loading services, startup applications, security software, or performing background tasks after you reach the desktop.
If the system feels responsive and you're not experiencing login delays, freezes, or performance issues, these fluctuations alone are usually not a cause for concern. To get a more accurate picture of startup performance, you could compare the results with Windows' built-in tools such as Event Viewer, which can provide detailed boot and sign-in timing information.
If you notice a consistent increase in sign-in times, or if the system becomes noticeably slower during startup, feel free to share additional details about your startup programs and system configuration so the community can help investigate further.