Permanent FPS drop over a 5-10 minute play period

[Academia]

Hello Warframe Community,

I have been experiencing large amounts of lag and it's gotten so bad I can't play any longer. It has only happened recently in the past week. I will log onto Warframe, everything will be a nice 60fps around my ship environment, then I start a simple mission like a Nitain Extract Alert mission and within 5-10 minutes of playing, my FPS will drop to about 20-40 FPS depending on where I am in the map. Then, after the mission ends, I return to my ship and the FPS stays at around 20-40. Thinking it might be something with my own computer, I did a factory reset and then downloaded all of the updates and latest drivers for my video card. After everything was reset and wiped clean, I downloaded Warframe again and the same thing seems to be happening. I'm not really sure what to do from here so I came for some suggestions and help.

Here is some general information on my system I'm using, if you need more information to suggest a solution, just ask away:

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System Information
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Time of this report: 4/21/2016, 12:43:01
       Machine name: ENOKII-PC
   Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_ldr.160317-0600)
           Language: English (Regional Setting: English)
System Manufacturer: Alienware
       System Model: M14xR2
               BIOS: InsydeH2O Version 03.72.24A13
          Processor: Intel(R) Core(TM) i7-3610QM CPU @ 2.30GHz (8 CPUs), ~2.3GHz
             Memory: 8192MB RAM
Available OS Memory: 8074MB RAM
          Page File: 2950MB used, 13196MB available
        Windows Dir: C:\Windows
    DirectX Version: DirectX 11
DX Setup Parameters: Not found
   User DPI Setting: Using System DPI
 System DPI Setting: 96 DPI (100 percent)
    DWM DPI Scaling: Disabled
     DxDiag Version: 6.01.7601.17514 32bit Unicode