A developer has deployed an AWS Lambda function written in Python, which inserts data into an RDS MySQL database. The function code is as follows:

def handler(event, context):
    mysql = mysqlclient.connect()
    data = event['data']
    mysql.execute(f"INSERT INTO foo (bar) VALUES (${data});")
    mysql.close()
    return

def handler(event, context):
    mysql = mysqlclient.connect()
    data = event['data']
    mysql.execute(f"INSERT INTO foo (bar) VALUES (${data});")
    mysql.close()
    return

Upon testing the function, it has been observed that the initial execution takes 2 seconds to complete, whereas the subsequent executions take 1.9 seconds.

What strategies or modifications can be employed to enhance the execution time of this Lambda function?