Send the 1 month old laptop back to service center. After a week they return back with full reset. I tested it on the spot at service center and it is still very slow. Next I did an acer care center diagnose on the HDD and it show hardware error. Request them to change HDD from WD to Seagate.
Just collect back the laptop two days ago and now it seem slight faster. Do perform HDD check when slow.
Overall still disappointed with this laptop performance.