Inspector Panels

Thus far I have been tinkering with a few of these… What Im not able to find is there a method where I can read a file just the once to parse data for the key value pairs… All I can get back is 'String' no objects, arrays… At present I have to do this once for each and that seems like a lot of waste… time & repetitive code. My concern is while it works with small test files when they get larger it may be too slow to be of use… TVM