There are several reasons why a site may be experiencing slowness. With today's modern internet speeds are normally not an issue.
Your internet is too slow or you are running too many applications at the same time.
Many times we see users, who do not understand why their tax program is running slow. You have to examine what applications are running.
Do you have music streaming?
Is someone watching videos?
Is your internet shared?
There are many factors that can cause your application to run slowly.
Make sure your computer is updated. An older computer might be your issue.
There are many reasons why a computer might have issues, try the basics, turn off unused applications, and turn off streaming services.