Rule of Rose getting slower and slower as I play

[Simmi]

Hello everyone!
So I'm doing a Let's Play on Rule of Rose and I have noticed that the further I go in the game, the slower it gets, especially if there are a lot of mobs in the area. Cutscenes often makes the game crash now, and some area are simply almost unplayable. I don't know what causes this, I've fixed the "cutscene don't show" problem but this slowmotion effect when I play is getting stronger and stronger. Right now I'm approaching the end of the game, I probably have 2 to 3 hours of gameplay left before I finish it, but it's getting really stressfull because I know it might crash at any moment now... Anyway if you could help me please
Thank you!

[jesalvein]

In order to help you further with your problem, please make sure the following are all provided.

• Your hardware specs - CPU, Graphics Card, Memory, Operating System.
  
• The version of PCSX2 you are using.
  
• Any non default settings you are using.
  
• What games you are trying to play and if you are playing them from ISO or DVD.
  

Thank You.

[Simmi]

Hello again!

Here are my specs:
Intel Core i7 4700HQ at 2.40 GHz
NVIDIA GeForce GTX 860M
8 Go of memory DDR3 at 798.14 MHz
Windows 8.1

I hope these specs make sense to you, I'm French so I'm trying to translate those as I have them in French on my PC...

PCSX 1.2.1

I play with the ISO (I do own the game though, I just don't want to damage it)
And it's Rule of Rose (USA version as the European one keeps crashing in the first chapter of the game)

[Simmi]

Hello!
Sorry for posting again but I'm worried my post will be forgotten XD So nobody has any ideas what could cause this slow down?

[vsub]

What does the EE/VU says in the titlebar of the game window when that happen.

[Devina]

You're on 1.2.1?

Upgrade to 1.4.0 or 1.5.0 (development build).