Fix slow queries in Django when using annotate and subqueries

1. 1Identify slow queries using Django Debug Toolbar or built-in query logging
2. 2Use select_related() and prefetch_related() to reduce database hits
3. 3Apply annotate() with calculated fields instead of subqueries when possible
4. 4Optimize subqueries with exists(), filter(), or aggregate functions
5. 5Test and compare query performance using explain() and query timing tools

Backend developers and data engineers working with Django can benefit from this lesson to improve query performance and reduce latency

💡 Using select_related() and prefetch_related() can significantly reduce database hits and improve query performance

🚀 Speed up your Django app by fixing slow queries with annotate and subqueries! 💡