Release Notes

🚀 Major Features

Middleware and IPC Rewrite

• Unified Metrics Calculator: Consolidated frame metric calculation system so that dynamic queries, frame queries, and the stand-alone console application all share the same single point of implementation for calculation logic
• New Query Framework: Complete rewrite of Middleware query registration and polling
  • Query registration is now strictly validating queries and outputting detailed info to the diagnostic layer
  • Dynamic query stats calculations reimplemented, solving several calculation bugs
  • Service now has visibility on the metrics consumed by each client and enables telemetry accordingly
• New IPC: Complete rewrite of IPC that decouples telemetry from frame data and improves transport consistency
• Multi-Device Support: Support for querying metrics across multiple GPU devices and system components
• Independent Telemetry: It is now possible to gather telemetry data without targeting a presenter, and telemetry data rate is no longer tied to frame rate

Enhanced Metrics

• Improved Animation Error Tracking: Better source tracking and error handling for animation-related metrics

ETW Session Management

• Provider Lifecycle Improvements: Better tracking and management of ETW provider enable/disable operations with proper data quiescing
• Session Coordination: Separated ETW session startup from provider enabling for more reliable operation and reduced race conditions
• Anticheat Mitigation: Above changes enable PresentMon to gather data from certain titles that otherwise block ETW trace gathering

🔧 Performance & Reliability Improvements

Performance

• Service now only polls telemetry for a device only when a client is actively consuming metrics for that device

Logging & Diagnostics

• Enhanced Logging System: Significant performance improvements with async logging, throttling, and diagnostic options
• Verbose Module Support: Better CLI helpers and diagnostic capabilities for troubleshooting
• Crash Recovery: Added log flush on crash and improved error reporting
• ETW and Frame Latency: Added detailed debug logging to track ETW event delivery latency and service frame processing latency

🛠️ API & Integration Updates

New API Features

• Metrics can be tracked for multiple adapters within the same query
• Dynamic queries can be polled without a target process (set PID to 0)
  • Only queries that contain no frame metrics can be used this way

API Behavior Changes

• Query registration validation is much more strict than previously
• Most API errors now have detailed diagnostics output to the diagnostics channel (see PresentMonDiagnostics.h)
• Metrics related to the CPU (frequency, utilization, name) now are associated with a new System device (ID=65536) instead of the Universal device (ID=0)

🐛 Bug Fixes

• Fixed shader path resolution issues
• Resolved race conditions in service backpressure handling
• Corrected frame metric calculations for CPU busy/wait times
• Fixed frame metric calculation bug when combining percentile and raw stats for the same metric
• Fixed percentile calculation algorithm (e.g. 99% was effectively reporting MAX instead)
• Fixed Intel adapter LUID detection and memory reporting
• Improved ETW session management and provider lifecycle

📦 Dependencies & Infrastructure

• Scriban: Updated to v6.6
• CSVHelper: Updated to latest version
• IGCL: Updated Intel Graphics Control Library
• Installation: Enhanced cleanup of AppData folders during install/uninstall

This release represents a significant architectural improvement with the introduction of the middleware and IPC layers while maintaining backward compatibility and improving overall system reliability.