Finally, after the 3 years when warranty is up. I decide to change the seagate HDD to Lexar NS100 SDD and the bottleneck is gone. It is the HDD that is the bottleneck but Acer service center disagree. Total cost of upgrade SSD $29 (128GB) and USB to SATA cable $4.50 and the backup and upgrade took about 4 hours. Now the speed of the laptop is normal (not superfast but fit for daily use). Previoysly load an application tooks 3 mins 50 sec, after the upgrade it took only 47 sec.
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Tinkerer