Low FPS Despite Adequate Spec

[JasonH565]

Hello! I'm trying to emulate PS2 for old times sake which is why I am here in the first place. I've installed PCSX2 and followed the setup carefully but somehow the game lags which tops at 30-40% speed. I'm trying to play Gran Turismo 4 and Black but both unfortunately lag a lot. I've read almost anything I could find in the internet yet none has solved my problem. I've tried all combination of settings but it doesn't change anything which is weird because in *removed. Contains piracy link* the game runs smoothly.

My spec is:
i3-4150
GTX 750ti
8GB RAM
PCSX2 1.5

When I open task manager, it shows that PCSX2 only uses around 10% of CPU power and when playing, the top info bar shows that I'm using 100% EE and low GS. How should this be dealt? 

[lightningterror]

Enable MTvu speedhack , check if your power plan is set to performance.

[JasonH565]

Enable MTvu speedhack , check if your power plan is set to performance.

Is MTvu the Multi-Thread microVU1? If so I've turned it on but am still stuck at 30% speed. I am using computer and my power setting is already set to high performance if that is what you mean.

[refraction]

What are your gsdx settings? You're not trying to do native x8 or something are you?

[pandubz]

the top info bar shows that I'm using 100% EE and low GS

I don't suppose you set the EE or IOP to Interpreter mode, or turned down the EE cyclerate to 50%?

[JasonH565]

What are your gsdx settings? You're  not trying to do native x8 or something are you?

Adapter: GTX 750ti
Renderer: Direct3D 11 Hardware
Interlacing: Auto
Texture: Bilinear (PS2)

Allow 8-Bit Textures on
Native internal resolution
Basic (fast) mipmapping
Full (D3D Recommended) CRC Hack Level

I don't suppose you set the EE or IOP to Interpreter mode, or turned down the EE cyclerate to 50%?

No, both are on compiler mode and EE cyclerate is set to normal/higher than normal but the result is the same.

[JasonH565]

Update: I have tried using another computer which has a better spec (i3 6500 1050 Ti) and it's very playable and I even achieved 200% speed (turbo) on 1600x900 resolution. I noticed that the CPU consumption reached about 25% so I guess the problem is with my CPU. Has anyone ever experienced this?

[lightningterror]

You should be getting around 30-70% EE. Which is what I'm getting.

[CK1]

Make sure MTGS is disabled (why do we still have a GUI for that option?)

[JasonH565]

You should be getting around 30-70% EE. Which is what I'm getting.

Yep I should have yet I don't 
Watching other people playing games normally in YouTube is quite heartbreaking.

Make sure MTGS is disabled (why do we still have a GUI for that option?)

It's disabled yet no change to the FPS.