Message Processing Pipeline Performance Critical - 94% Under Target Throughput

[BP602]

Problem

Current message processing achieves only 6.7 msg/s vs target of 100 msg/s (94% deficit). Sequential processing pipeline creates severe bottleneck during chat bursts.

Impact

• UI freezing during high-volume chat
• Message queuing and delays
• Poor user experience in active chatrooms

Root Cause

Sequential processing in message pipeline:

// MessagesHandler.jsx - O(n²) filtering on every render
const filteredMessages = useMemo(() => {
  return messages.filter((message) => {
    // Complex filtering runs on every message update

Solution

1. Implement parallel message processing
2. Add message batching for UI updates
3. Pre-index messages by chatroom for O(1) filtering

Success Criteria

• Achieve 50+ msg/s sustained throughput
• Reduce P95 message latency to <200ms
• Eliminate UI blocking during message bursts

Files to Modify

• src/renderer/src/components/Messages/MessagesHandler.jsx
• src/renderer/src/components/Messages/MessageParser.jsx

Priority: P0 (Critical)
Estimated Effort: 3-4 days