My Experience with QTP performance............
Recently I have received testdata in a text file from my system admin. The file has 360000 lines in which I need to read the data line by line and separate it(with some logic) and write into an excel. I have written a vbscript to do my job.
QTP has taken 10+hours to complete the job execution.
VBS editor has taken only 2 minutes to complete the job execution.