Graphics seize every ~2s

[aeonoforigin]

For about a week I had a bug where the graphics of warframe, in both the orbiter and missions/PoE, would freeze for a fraction of second every 2 seconds consistently. Sound was not affected, but the game was difficult to play when it can freeze in the middle of aiming.

I was able to resolve this issue by verifying and optimizing my download cache, but was unable to find this advice in this or any other forum. 

The issue persisted across changes to DirectX drivers used, multithread rendering allowed and disallowed, and varied dynamic rendering settings.