Speed dropping to 40-60% at some points

[Mendozus]

I'm using pcsx2 to run Ace Combat 4: Distant Thunder - one of my all time favourite games. Up until this point the speed has been pretty consistent at 90-100%, sound has been a little robotic but otherwise no issues. Start of one particular mission however, the speed immediately drops to 40% and then stays between 40 and 60. I have messed around with the settings to try and fix but no use. I am a total emulator noob so there may be something super simple that I'm missing, hopefully someone can point me in the right direction to get this amazing game working.

Many thanks

[CK1]

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, such as speed hacks or presets.
  
• Your GSdx graphics settings (a picture of the settings dialog is preferred)
  
• What games you are trying to play and if you are playing them from ISO or DVD.
  

Thank You.

[Mendozus]

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, such as speed hacks or presets.
  
• Your GSdx graphics settings (a picture of the settings dialog is preferred)
  
• What games you are trying to play and if you are playing them from ISO or DVD.
  

Thank You.

CPU: Intel Core i7 Quad-Core 7700k (4.2GHz)
RAM: 16GB Corsair VENGENCE DDR4
GPU: 8GB NVIDIA GTX 1080
SSD: 480GB Kingston UV400
HDD: 1TB SATA-III 3.5"

I have not changed any of the default settings as of right now, I did try enabling speedhacks and a few other options but none worked, so I have reverted to default settings.

[wheninrome]

I'm using pcsx2 to run Ace Combat 4: Distant Thunder - one of my all time favourite games. Up until this point the speed has been pretty consistent at 90-100%, sound has been a little robotic but otherwise no issues. Start of one particular mission however, the speed immediately drops to 40% and then stays between 40 and 60. 

Many thanks

Can you be specific on what exactly the mission it is that slows down?

[teots]

You might want to reset all emulator setting to default, download and use the latest pcsx2 1.5
emulator and graphics card driver.