🐛 Bugfix: Why did the Vibe page freeze after 15-20 minutes of generati...

Date: 2026-02-25
Time: 14:47:06 UTC
Session: gspace1-138.6
Agent: angular
Confidence: 98%
Status: ✅ Documented

📋 Decision Context

Question:

Why did the Vibe page freeze after 15-20 minutes of generation (Bug 10)?

Task: Fix Bug 10 page freeze

🎯 Decision Made

Chosen:

Batch SSE events + truncate content + cap arrays + cleanup timers (6 compounding fixes)

Options Considered:

1. Throttle individual signal updates
2. Batch SSE events + truncate content + cap arrays + cleanup timers
3. Move generation to Web Worker

💭 Reasoning

Root cause was 6 compounding memory/performance issues: (1) handleContentDelta() concatenated strings indefinitely — fixed with 500ms batched flushes and 150-line truncation. (2) handleFileCreated() stored full file content in memory — fixed to store metadata only. (3) 40+ file_created SSE events fired synchronously — replaced with single files_batch event. (4) validationIssues array grew unbounded — capped at 50. (5) Workflow subscription lacked takeUntilDestroyed — added. (6) Post-completion work ran too soon (500ms delays) — increased to 2s/2s/3s. Also fixed contentFlushTimer cleanup in disconnect() and SSE onerror race condition (1s delay before reporting 'Connection lost').

📁 Files Involved

• libs/libs-ai/gograb-ai-lib/src/lib/services/workflow-state.service.ts
• libs/libs-structural/vibe-universe/src/lib/components/vibe-universe-generator/vibe-universe-generator.component.ts
• apis/backend-vitto-api/src/app/module-generation/phases/module-gen-phase.executor.ts

🔗 Related

• Decision ID: dev_1772030826740_jav950u
• Session: 138
• Workspace: gspace1

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