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System Information

The Performance view has five tabs: Summary, CPU, Memory, System Activity, and Disks. History graphs move smoothly between real samples. CPU and memory follow the configured refresh interval; disks use a separate 500 ms interval.

Opening

Select Performance in the main navigation or press Ctrl+2. The System Information command (Ctrl+I) also opens this view.

Press Ctrl+4, or click a disk activity LED in the main window or floating widget, to go directly to Disks. Opening it from the widget restores the main window and leaves Compact mode when necessary.

Summary Tab

The default view shows an overview of your system:

Section	Metrics
CPU Graph	Total + kernel history sparkline (60 samples)
RAM Graph	Memory load % history sparkline (60 samples)
Totals	Handles, threads, process count
CPU	Total %, kernel %, user %
Memory	In-use, available, total (GB)
Topology	Physical cores, sockets, logical processors

The header shows the CPU model name, core/thread count, and total RAM capacity.

CPU Tab

Detailed CPU metrics:

Metric	Description
History Graph	Full-width CPU total + kernel sparkline
CPU Model	Processor name from registry
Cores	Physical core count
Logical	Logical processor count (threads)
Total %	Overall CPU utilization
Kernel %	Time spent in kernel mode
User %	Time spent in user mode

Memory Tab

Comprehensive memory breakdown:

Metric	Description
History Graph	Memory load % sparkline
Total	Total physical RAM (GB)
In Use	Currently used RAM (GB + %)
Available	Free physical RAM (GB)
Commit Total	Current commit charge (GB)
Commit Limit	Maximum commit limit (GB)
Commit Peak	Highest commit since boot (GB)
Paged Pool	Kernel paged pool (MB)
Non-Paged Pool	Kernel non-paged pool (MB)
Handles	Total system handle count

System Activity Tab

System-wide I/O and kernel metrics:

Metric	Description
Processes	Total process count
Threads	Total thread count
Handles	Total handle count
Paged Pool	Kernel paged pool (MB)
Non-Paged Pool	Kernel non-paged pool (MB)

Disks Tab

Choose All disks combined or a physical disk from the selector. Drive letters identify the volumes belonging to each disk; one physical disk may have several volumes.

Metric	Description
Active time	Disk utilization and its percentage history
Transfer rate	Separate read and write histories, with an adaptive graph scale
Read / Write	Current transfer rates
Average response time	Request latency; combined latency is weighted by transfer count
Current disk queue	Outstanding requests, summed in combined mode
Total read / written	Bytes accumulated since monitoring started
Transfers per second	Read and write operations per second
Physical disks	Number of available disks included in the current view

Combined active time is the average across available disks. Transfer rates, operations, queues, and session byte totals are sums. A missing value is shown as unavailable rather than as zero.

Disk history keeps 120 samples at 500 ms, approximately 60 seconds, independently of process-list refresh and pause detection. The disk LED is green for reads, red for writes, amber for both, and dim when idle or unavailable. Its tooltip shows the current state, transfer rates, and the Ctrl+4 shortcut badge.

Disk counters come directly from Windows disk drivers. No PDH/PerfDisk category registration is needed. Initial sampling and device errors have explicit states; reconnecting devices are rediscovered. Sampling pauses when neither the main window nor the floating widget is visible.

How It Works

CPU and memory collection

The SystemMetricsCollector singleton gathers metrics on each process refresh cycle:

CPU times via GetSystemTimes (idle, kernel, user)
Memory via GlobalMemoryStatusEx
Commit charge via GetPerformanceInfo
CPU topology via GetProcessorInformation and registry
History stored in 60-sample circular buffers

Metrics are collected alongside the process refresh cycle. Cached drawings animate between samples without extra polling. Animation pauses when a graph is hidden or its host window is minimized, and respects Windows animation settings.