I am a professional developer with over 30 years experience in software development, with the last 16 years specializing in C# and WPF.
When it comes to code optimization there are often many factors that influence execution speed. Often times code can be improved by someone with a fresh perspective, and at other times code is already optimal, but the user experiences it as slow - this could be improved by showing the user that something is happening (maybe show a progress bar instead of a blank screen).
I would love to take a look at your system and code, investigate the issues and report back to you on what I can do to improve things.
All my work is guaranteed and I provide after-care service to all my clients.