Fortune.com is a leading global business news website, an integral product of Fortune Media IP Limited. With a legacy that spans over 92 years, Fortune has proven its mettle in delivering business news, financial information, and insights about the world's most powerful companies and their market trends. The site offers an immersive user experience with its unique blend of in-depth news articles, entertaining videos, and interactive infographics. We're here to unpack every detail about this website in the following categories:

1. Content Quality : Fortune.com possesses an extensive collection of business-related articles that are curated by seasoned financial journalists and experts, ensuring the highest quality of content. Rigorous research is reflected in each piece, with the aim to provide readers the most accurate and recent business trends and news. The site also offers exclusive content for Fortune.com subscribers, demonstrating their commitment to value-added content for devoted readers.
2. User Interface and Experience Design : The website blends aesthetic appeal with functionality, offering a clean, well-structured, and intuitive user interface. With a sophisticated design that seamlessly segments news by industry and categories such as 'Leadership', 'Most Powerful Women', and 'World's Greatest Leaders', it allows users to navigate effortlessly to their preferred sections. Furthermore, the use of interactive infographics and videos enriches the user experience, making information consumption a delight rather than a task.
3. Website Performance and Speed : Fortune.com boasts an optimal speed and performance, even when loading media-rich pages, maintaining swift navigation through the site. This responsive design enhances the user experience by eliminating lag and reducing the overall waiting time, which is paramount in retaining readership in the digital age.
4. Reliability and Trustworthiness : Fortune.com commands substantial credibility and trust in the world of business publications. The website ensures the authenticity of every information published by lining up some of the most respected names in financial journalism who delve deeply into the topics.
5. Mobile Compatibility : Fortune.com's mobile view is as clear and easy to navigate as its desktop version, a factor that draws the increasingly mobile-savvy audience. Its mobile app is equally efficient, presenting an organized layout, simple menus, and speedy loading times making reading articles on-the-go a breeze.
6. Customer Service : The website has a highly responsive customer service team, offering quick and helpful solutions to queries or concerns raised. Additionally, they appreciate user feedback to enhance their service offerings continually.

In conclusion, Fortune.com is a go-to online portal for all things business, providing a blend of insightful, data-driven news articles and analyses. Its user-friendly design ties into its commitment to deliver valuable content in a digestible format, raising the bar for business news platforms worldwide. The minor improvement could be in the addition of more visual elements like infographics and videos that cater to the preferences of the modern reader.