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To improve query performance in a database using Go, you can utilize the following methods:

• Indexing: create indexes on frequently used fields in WHERE or JOIN conditions.
• Prepared statements: allow reusing queries with different parameters, reducing overhead.
• Pagination: limit the number of returned records using LIMIT and OFFSET.
• Caching: store results of frequently executed queries in memory (e.g., with Redis or built-in cache).
• Query optimization: analyze and rewrite SQL queries to reduce the number of operations and data volume.
• Using connection pooling: to reduce the costs of establishing connections to the database.

Example of using a prepared statement in Go with the database/sql package:

stmt, err := db.Prepare("SELECT name FROM users WHERE age > ?")
if err != nil {
    log.Fatal(err)
}
rows, err := stmt.Query(30)
// process rows

These methods will help reduce response time and decrease the load on the database.