MUHAMMAD RIZKY; M. FAHRUL A; AGFA OKTAVIANA; MASBINA AJENG LESTARI. Testing the Website Performance of SMA Muhammadiyah 4 Yogyakarta Using K6 Tools and GTMetrix. Jurnal Sistem Informasi dan Teknologi Informasi, [S. l.], v. 1, n. 1, p. 26–30, 2022. Disponível em: https://journal-siti.org/index.php/siti/article/view/8. Acesso em: 27 oct. 2025.