Weird Stutter

Hello there,
I have been experiencing a lot of stuttering in my project which I am having a hard time understanding.
You can find a video of it here :

Basicly I have a thread running every 5-7 seconds that involve a massive fps drop, and I can’t find the reason why (happens in editor and packaged build)
Nav mesh rebuild is async, streaming and GC are also async with a consequent pool for texture (8000MB), I have a strong computer but it happens on a lot of other computer tested too (5 to 6) that were really strong ones. Only common point : they all use nvidia video card.

The drop doesnt come from the gpu (stat gpu doesnt show any variation). So I don’t really know where to look for now If you have any idea, that would be amazing !
The project doesnt use c++ and is full blueprint but overall performance is not an issue here.

Thanks a lot !

System Information

  Time of this report: 2/8/2019, 15:40:41
         Machine name: DESKTOP-3TAO71T
           Machine Id: {AF85024D-5F75-491A-9FA6-C3B6E22259BB}
     Operating System: Windows 10 Professionnel 64-bit (10.0, Build 17134) (17134.rs4_release.180410-1804)
             Language: French (Regional Setting: French)
  System Manufacturer: MSI
         System Model: MS-7A33
                 BIOS: 3.60 (type: UEFI)
            Processor: AMD Ryzen 7 1700 Eight-Core Processor           (16 CPUs), ~3.0GHz
               Memory: 16384MB RAM
  Available OS Memory: 16330MB RAM
            Page File: 38383MB used, 7341MB available
          Windows Dir: C:\WINDOWS
      DirectX Version: DirectX 12
  DX Setup Parameters: Not found
     User DPI Setting: 96 DPI (100 percent)
   System DPI Setting: 96 DPI (100 percent)
      DWM DPI Scaling: Disabled
             Miracast: Available, with HDCP

Microsoft Graphics Hybrid: Not Supported
DxDiag Version: 10.00.17134.0001 64bit Unicode


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