It's always, but after 2018 - page load speed is important for SEO because it is one of the key determining factors for Google's algorithm.
Slow sites turn visitors away. Bounce rate can increase as well and fast sites provide good user experiences for your visitors, and Google will rank those sites higher than slow-loading ones.
Make sure your website open within 1 to 5 secs. More than 5 secs can hurt site performance. I would like to suggest you to use Google web development tool to check and analysis your website. Let me know if you have question