Have you made modifications to the code to improve program performance?

Yes, I made code modifications to improve performance. This usually includes:

• Optimizing algorithms (for example, replacing nested loops with more efficient data structures).
• Using caching to reduce repeated calculations.
• Parallelizing tasks with goroutines or other mechanisms.
• Reducing memory allocations to lessen the load on the garbage collector.

Example: if there was a slow search in a slice in the program, I replaced it with the use of a map for quick access by key.

// Was
func contains(slice []int, val int) bool {
    for _, v := range slice {
        if v == val {
            return true
        }
    }
    return false
}

// Became
func containsMap(m map[int]struct{}, val int) bool {
    _, exists := m[val]
    return exists
}

This approach significantly speeds up searches with large data volumes.