I met for some time freeze concerns on DCS 4 to 5 seconds. that can occur at any time.   
They happen anytime it can be quietly at the parking lot, in full flight during a splash or just by opening the map with F10.   
I noticed at this point in the task manager that the application DCS does not respond.   
Here is my config: 
Motherboard: MSI Z87-G45 GAMING 
processor: i5 4670k 3.40 OC to 4.00 (I specify that the freeze were present before the OC.) 
graphics card: gtx 1060 6gb 
Ram: 16 GB 
SSD: kingston 480 giga for dcs.      
I enclose two screen caputre. The first is an afterburner screenshot during the freeze. The GPU drops to 0%.   
the second is my graphical settings.     
If you have an idea or a tip do not hesitate.