Laptop performing terribly compared to how it used to

[Dominik Mikac]

When playing any demanding game my frame rate will drop to 5-10 FPS occasionally or it freezes completely for 0.5-1 second. It's unbearably annoying. I don't have a lot of programs on my laptop and I think this is probably a hardware problem.
For example, I used to be able to run Deus Ex: HR normally at medium settings with a stable frame rate, now it's completely unplayable from the start.
I cleaned the inside of my laptop a few months ago and it seemed to help a bit, but I didn't help restore its original performance.
Here are the specs taken from Speccy:

Operating System
Windows 7 Professional 64-bit SP1
CPU
Intel Pentium B970 @ 2.30GHz 57 °C
Sandy Bridge 32nm Technology
RAM
6,00GB Dual-Channel DDR3 @ 665MHz (9-9-9-24)
Motherboard
ASUSTeK COMPUTER INC. K55VD (SOCKET 0) 58 °C
Graphics
Generic PnP Monitor (1366x768@60Hz)
Intel (ASUStek Computer Inc)
2047MB NVIDIA GeForce 610M (ASUStek Computer Inc) 50 °C
Storage
931GB Seagate ST1000LM024 HN-M101MBB (SATA) 37 °C
Optical Drives
TSSTcorp CDDVDW SN-208BB
Audio
Realtek High Definition Audio

Thank you for your time

 

[Reyaz123]

Defragment your hard drive using defraggler from piriform

 

[Dominik Mikac]

I will try your suggestion, thank you