Scaling WebSocket applications requires considering: 1) Load balancing with sticky sessions/session affinity, 2) Horizontal scaling capabilities, 3) Connection pooling and management, 4) Message broker integration for cross-server communication, 5) Monitoring and metrics collection, 6) Resource limitation and throttling, 7) Database connection pooling, 8) Caching strategies, 9) Failover mechanisms, 10) Geographic distribution for reduced latency. These considerations ensure reliable performance under load and growth.