<div style="text-align: justify;"><p><em>The emergence of several technical problems related to the availability of adequate functional features, led to the need for an analysis of the website performance of the UPT "Veteran" East Java Library, so that the website's performance was in line with user expectations. This research analyzes the website of the UPN "Veteran" East Java Library UPT website using the Webqual 4.0 method, aiming to find out the website indicators that need to be maintained and improved performance. The analysis is carried out referring to the Usability, Information Quality, and Service Interaction Quality parameters, where each parameter consists of indicators. The sampling technique used is proportionate stratified random sampling, with website users as respondents. The method of data collection is in the form of distributing questionnaires. The data were analyzed using the Importance-Performance Analysis method. The results showed that the overall performance of the UPT "Veteran" East Java Library website was sufficient to meet user expectations. However, it was found several indicators that need to be improved by the website manager, namely: ease of understanding website navigation, attractiveness of Website appearance, and the availability of information on websites that are easy to understand.</em></p><p><strong><em>Keywords:</em></strong><em> Performance; Importance-Performance Analysis; Usability; Information Quality; Service Interaction Quality</em></p><p align="center"><em> </em></p><p><strong>Abstrak.</strong> Munculnya beberapa permasalahan teknis yang berkaitan dengan ketersediaan operasi fitur-fitur fungsional secara memadai, menyebabkan perlunya dilakukan analisis kinerja <em>website </em>UPT Perpustakaan UPN “Veteran” Jawa Timur, agar kinerja <em>website</em> sesuai harapan pengguna. Peneltian ini menganalisis website UPT Perpustakaan UPN “Veteran” Jawa Timur menggunakan metode <em>Webqual</em> 4.0., bertujuan mengetahui indikator <em>website</em> yang perlu dipertahankan dan ditingkatkan kinerjanya. Analisis dilakukan mengacu pada parameter <em>Usability</em>, <em>Information Quality, </em>dan <em>Service Intteraction Quality, </em>dimana setiap parameter terdiri atas indikator. Teknik sampling yang digunakan adalah <em>proportionate stratified random sampling,</em> dengan responden pengguna <em>website</em>. Metode pengumpulan data berupa penyebaran kuesioner. Data dianalisis menggunakan metode <em>Importance-Performance Analysis</em>. Hasil penelitian menunjukkan secara keseluruhan kinerja <em>website</em> UPT Perpustakaan UPN “Veteran” Jawa Timur sudah cukup memenuhi harapan pengguna. Namun ditemukan beberapa indikator yang perlu ditingkatkan kinerjanya oleh pihak pengelola <em>website</em> yaitu: kemudahan memahami <em>Navigasi website, </em>kemenarikan tampilan <em>website</em>, serta ketersediaan informasi pada <em>website</em> yang mudah dimengerti.</p><p><strong>Kata kunci:</strong> Kinerja; <em>Importance-Performance Analysis</em>; <em>Usability</em>; <em>Information Quality; Service Intteraction Quality</em></p></div>