Rubanitor/Shutterstock CTRL+Alt-Delete is one of the most well-known PC hotkeys, used primarily to access the system task manager. The tool is essential for force-closing frozen apps, reviewing system performance, checking what background processes are running, and closing them, like when the Windows Runtime Broker spikes your CPU usage . At a glance, you can see CPU, memory (RAM) and disk usage and more. Many learn to rely on the tool as a sort of benchmark of performance and to better understand the operating system.  But maybe don't take those numbers at face value. According to its original creator, former Microsoft operating system engineer Dave Plummer, the task manager may be lying about the performance numbers. It has to do with how the application polls data. As Plummer explains, measuring CPU and system resource usage is complicated. "Either the CPU is busy, or it's not, right?…