Common Causes
Shared-resource contention, slow disk I/O, database bottlenecks, missing caching/CDN, heavy page assets, inefficient application code, network latency, TLS configuration and insufficient server resources.
What to Test
Run performance tools, check CPU/RAM/disk metrics, enable logs and profiling, inspect slow database queries, optimise assets and verify network routing.
Optimisation Actions
Use caching and a CDN, compress images, defer non-critical scripts, optimise database indexes and queries, and scale infrastructure when genuine resource limits are reached.