If your website is not custom-designed or developed on a tool to create a link, the website would possibly be worse than it should be due to the bloated code underneath the site's surface. Taking an SEO training course or SEO PPC courses will give you some idea to deal with this.
If you're using a content management system like WordPress, you can add plugins to help perform various activities on our websites, such as a popup, a cookie bar or a feedback form. You have to know that the website will be held down by too many plugins.
There are also several plugins installed by website owners that link to various code libraries and take time to analyse thousands of code lines. In several hundred rows, there could be a tailored approach and no external libraries would need to reference them. A few plugins on a website will help you, but more than enough can destroy your page speed. Make sure you need them when you have plugins installed on your website, and no better solution is available there.