Weird problem: Render time increases frame-by-frame I've encountered a very weird phenomenon which I have trouble with: When I render my scene (using the Cycles engine), the initial render time of the first frame is at around ~2 seconds. However, with each frame that is rendered after that, the render time increases by a few hundredths of seconds, sometimes a tenth of a second. After some time, the render time for a single frame has reached almost 1 minute.

The scene itself is not very complex, save for a (baked) particle system and some drivers (which cannot be the source of the problem, since I've created a version of the scene WITHOUT those objects for test purposes - and the same problem remains).

I'm rendering with version 2.79b on a Lenovo Thinkpad T550, which is sufficient since the scene is - as mentioned - not very complex.

Any help/suggestions would be appreciated!
I think I've found the culprit: Through reverse-engineering, removal of geometry and exclusion of certain RenderLayers, I could determine that the increase in render time was caused by Curve objects (Bezier Circles). Once I'd converted those to regular meshes and did a re-render, the problem disappeared.