File Reading

as i am quite new to root, i have some trouble understanding a few things. but right now this is my concern: i have a few very large txt files to read and the macro i use for the reading takes forever to open and read all of them (about 10 minutes for 8 files, each containing about 32M points). does this seem about right or am i doing something drastically wrong? i used a modified version of the tutorial macro, and when it is run it runs one of my two processor cores at ~100% heating it up quite a bit.
thank you all very much for any help,

Is the time spent in calling ROOT functions?
difficult to tell you more without seeing a concrete piece of code and your data files.