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World Congress 2026 Europe • Jul 9, 2026 • Session details

".Net is too slow" was not an option

Tomasz Woznica

.NET isn't too slow for core banking if you architect it right. Discover how engineers used massive parallelization to execute legacy mainframe COBOL verbatim under 80 milliseconds.

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#1 about 3 min

Mainframe performance baseline and distributed computing challenges

Migrating a legacy COBOL system processing hundreds of database operations per request reveals severe network latency disparities compared to single-machine environments.

#2 about 2 min

Meeting service level agreements for batch processing

Complex end-of-day processes must execute entirely within a rigorous six-hour overnight window to consistently handle interbank transfers and system reconciliation.

#3 about 3 min

Addressing distributed database latency in driving cursors

Transitioning highly tuned database query architectures exposes extreme latency bottlenecks when repetitive cursor data trips over a network wire.

#4 about 3 min

Using session context for database workload orchestration

Passing concurrency range targets through database connection context variables limits queried batch sizes without mutating original core data retrieval signatures.

#5 about 3 min

Transparent query parallelization via source code annotations

Embedding control parameters securely inside compiler-ignored syntactical comments dynamically manages range partitions transparently avoiding original system logic alterations.

#6 about 2 min

Creating an event-driven task runner for parallel executions

Providing offset metadata allows a runtime application loop to spawn identical isolated processes against concurrent chunk segments to drastically reduce duration.

#7 about 3 min

Strategies for splitting flat files in distributed systems

Dividing large text batches into simultaneous streams requires properly aligning root rows precisely against supporting document files maintaining correct business relationships.

#8 about 2 min

Implementing virtual file splitting to minimize network overhead

Calculating precise byte skip instructions over a single network document avoids incredibly expensive temporary file duplication penalties transferring data.

#9 about 3 min

Optimizing flat file joins using network metadata pointers

Preserving resulting task array origins identically inside small referencing maps bypasses incredibly long waits inherently associated with physically appending outputs sequentially.

#10 about 3 min

Building a custom ORM to eliminate distributed transactions

Pre-fetching comprehensive contextual data mappings into transient machine-level memory prevents ongoing query repetition completely overcoming communication protocol latency limits.

#11 about 5 min

Final production metrics utilizing alternative compiler technology

Modernizing away from mainframe architecture empowers extensive transaction volume surges globally serviced quickly using entirely modern off-the-shelf distributed frameworks.

Matching moments

3:12 min

Evaluating the execution speed of legacy tech stacks

Lea Fragner · LIVE

2:23 min

Modernizing legacy execution and outdated mainframes

Ricardo Sueiras Sueiras · LIVE

6:35 min

Modernizing legacy COBOL mainframe systems using AI agents

Chris Heilmann +2 · LIVE

4:40 min

Analyzing COBOL mainframe migration challenges with AI

Michael Friedrich Michael Friedrich · WWC Europe 2026

1:02 min

Multi-agent AI for migrating legacy COBOL to Java

Julia Kordick Julia Kordick · WWC 2025

8:01 min

Solving architectural challenges during rapid public cloud migrations

Liam Hurrel +1 · WWC 2021

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