What are the main reasons that can lead to a decrease in query performance?

The main reasons for the decrease in query execution speed in Go can be related to several factors:

• Suboptimal algorithm or data structure: using inefficient algorithms or data structures can significantly slow down execution.
• Locks and resource contention: if multiple goroutines compete for a shared resource (e.g., a mutex), it can lead to delays.
• Long input/output operations: database queries, network calls, or file read/write operations can be bottlenecks.
• GC (garbage collector) issues: frequent or long garbage collection pauses can affect performance.
• Large data volume: processing large amounts of data without optimization can slow down execution.

For diagnostics, it is useful to use profiling (pprof) to identify bottlenecks.