Comprehensively consider the overall factors that affect the performance of the architecture, such as /O synchronization, concurrency, resource contention, and large data volume. Often, I/O operations, network responses, poor algorithms, databases, and other inefficient resource usage result in poor performance

C. Consider the application itself, such as code execution optimization, software design multi-threading or multi-process

D. Fully consider network performance, such as external network access bandwidth, data transmission efficiency, network path, etc.