What types of testing have you conducted, and what bottlenecks did you identify?

I have performed unit, integration, functional, performance, and security testing. In unit testing, I identified code complexity bottlenecks that caused slow execution of critical functions. Integration testing exposed API latency issues due to synchronous calls between microservices. Functional testing revealed UI rendering delays caused by large DOM trees. Performance testing uncovered database query bottlenecks and memory leaks in the application server. Security testing highlighted inefficient cryptographic operations that increased CPU usage. Across these tests, common bottlenecks included inefficient algorithms, lack of caching, suboptimal database indexing, and inadequate resource allocation. Addressing these issues involved refactoring code, adding caching layers, optimizing queries, and scaling resources.