Почему функция dataframe.to_sql работает очень медленно?

Прилагается код на Python:

@app.route("/conn/<db_file>")
def create_connection(db_file):
    """ create a database connection to the SQLite database
        specified by db_file
    :param db_file: database file
    :return: Connection object or None
    """
    conn = None
    try:
        conn = sqlite3.connect(db_file)
    except Error as e:
        print(e)

    return conn
def run(conn,sql):
    cur = conn.cursor()
    cur.execute(sql)
    conn.commit()

@app.route("/sql")
def create_project():
    """
    Create a new project into the projects table
    :param conn:
    :param project:
    :return: project id
    """
    t=str('a')+str(int(datetime.now().timestamp()))
    conn=create_connection("c:\\users\\user1\\desktop\\data.db")
    run(conn,f'''
    CREATE TABLE '''+
    t+''' (
    "host"  TEXT,
    "count" INTEGER,
    PRIMARY KEY("host")
);    
    ''')
    sql = mos1("1").to_sql(str(t),con=conn)
    cur = conn.cursor()
    cur.execute(sql)
    conn.commit()
    return sql

С уважением,

Натаниэль