My name is Udyam, and I have extensive experience and a passion for optimizing application functions just like Function A in your ASP.Net project. Over my five years of professional development, which includes working with technologies such as HTML, CSS, JavaScript, PHP, and WordPress, I have honed the inherent problem-solving abilities you seek. In fact, the camparative advantage that I hold over other candidate is my incorporate understanding of efficient data retrieval methods which essentially defines the issues you are experiencing with Function A.
When it comes to .Net or ASP.Net, I breathe these languages. I am well-versed in Microsoft SQL Server apart from being proficient in front-end and back-end development. For example, I recently worked on a similar project where I had to identify and fix performance issues affecting a function crucial to an e-commerce site's checkout process. My strategies involved identifying bottlenecks, optimizing database queries, caching appropriate data sets, and implementing parallel programming techniques where possible - all these to ensure a seamless integration with minimal downtime -- much like what you require.
To conclude why myself ought to be working on your ASP.Net application to elevate its performance; my proactive attitude towards problem solving along my expansive familiarity with not just .Net but the importance of fast data retrieval will be paramount in making this happen in record time without compromising quality.