Quote: "Does it always take long to open the file every time you run the app?"
Yes, Everytime.
Quote: "Maybe slow on the first time?"
Not Only
Quote: "Are you by any chance running the apk through Eclipse?"
When i run it from eclipse, it's the same thing .. it takes a long time. When i compile the package and deploy it manually, same issue.
In windows and when broadcasted through the android player : no problem.
You can try to simply call the "OpenToRead" command on a 500KB or 1MB text file and you will see (and if not .. i will check for my eclipse environment...)