OpenOpcUa – 2025‑2026 Evolution: Stability, Performance & Industrial‑Grade Reliability
A nine‑month transformation bringing stronger HA, faster VPI/VFI operations, optimized database connectivity, and a more resilient OPC UA server core
Introduction
Between June 2025 and February 2026, OpenOpcUa underwent one of the most significant upgrade cycles in its history. These releases introduced large‑scale improvements across the CoreServer, Stack, ClientLibrary, the entire VPI/VFI ecosystem, and all engineering tools such as XiMulator and ConfigManager.
This article summarizes the major enhancements and provides an overview of the component versions delivered throughout this period.
February 2026 – High Stability, VpiS7 Overhaul & SSL Enhancements
The February 2026 release focuses on stabilizing the entire platform. The CoreServer benefits from refined Publish‑timeout handling, improved HistoryContinuationPoint logic, and a fix for a Veeam‑related race condition in the VpiWriterThread.
A major milestone is the VpiS7 upgrade: atomic memory snapshots, GUARDSIZE protection against invalid reads, safer fragmented DB operations, and alignment with the 2026 VPI standard.
Several subsystems—including Vpi Library, VfiPgSql, and VpiValueInit—introduce SSL support, memory optimizations, and improved logging consistency.
January 2026 – Reinforced Stability and Better Database Security
The January update strengthens stability across the CoreServer, Stack, and ClientLibrary. Enhancements include better timeout mechanisms, mutex protections, improved HA/VFI synchronization, and safer initialization.
VPI components gain stronger WarmStart logic and improved concurrency handling, while VFI subsystems receive full SSL support, improved UDT handling, and more reliable MasterTable processes.
December 2025 – Deep Internal Hardening
December delivers extensive robustness improvements across all layers:
- Better HA calculations and timeout strategies
- Improved PublishRequest safety
- Stronger VpiUaClient handling of concurrency and state resets
- Safer and more consistent VfiPgSql persistence logic
This release ensures improved behavior under high industrial load and unstable conditions.
October 2025 – Performance Boost & Feature Expansion
October introduces foundational upgrades:
- Full parallelization of VPI start sequence
- Generic UDT initialization
- Expanded LUA scripting capabilities
- Major improvements to HA/VFI write performance (VfiHistoryWriteEx)
- Enhanced logging and backup mechanisms
This version sets up many of the optimizations seen later in the cycle.
September 2025 – Stronger HA Consistency & VFI Performance
This release focuses on operational coherence:
- Improved HA aggregates and startup behavior
- Better VFI buffering and MasterTable management
- Significant fixes in VpiS7, VpiMdbMaster, and VfiPgSql
- Harmonized APIs for NodeId persistence and logging
A solid release for integrators requiring deterministic behavior.
July 2025 – Robustness & Enhanced Historical Data Support
- Full OPC UA aggregate implementation (11 aggregates)
- Expanded LUA scripting
- HA/VFI write performance improvements
- Stronger reconnect handling
- More stable and reliable CoreServer behavior
A major step forward for Historical Access implementations.
June 2025 – Foundation of the 2025‑2026 Evolution
The June 2025 update establishes the groundwork for all subsequent releases:
- Critical stability fixes (crashes, leaks, HA/VFI inconsistencies)
- Major performance gains thanks to VfiHistoryWriteEx
- Parallel VPI startup
- Better UDT initialization
- Strong enhancement of Redundancy support
- Extended LUA scripting
A pivotal release initiating the transformation of the platform.
🟦 Conclusion
From June 2025 to February 2026, OpenOpcUa has evolved into a far more stable, secure, performant, and industrial‑ready solution.
These updates reinforce OpenOpcUa as one of the most advanced and robust open OPC UA platforms available today, suitable for OEMs, integrators, and mission‑critical industrial deployments.