after i upgraded from Blender 2.79 to 2.79b yesterday in order to use the cpu+gpu feature which btw apparently no longer exists . I tried to notice if there was any difference on the render time of a scene with emission particles flow + blur that i rendered just before, after the upgrade i opened the same untouched file with same Blender parameters (even user preferences), and this is the weirdest part... every time i hit F12 i got a longer render time and it seems like the light trail of the particles is getting longer like if the animation is running. (it's not, it has always been frame 107). I filled all of the 8 render result slots consecutively with the same frame and i got 8 results (12sec/13/15/20/30/54/1min44/3min) (the more blured it gets or the longer the particle's light trails are, the longer the time it takes to render) and it seems like the time is going up to the infinity as long as i keep rendering the same image, it takes longer and the result is more "changed"... Any idea about the reason it is changing ? thank you and sorry for my bad english. This is the first render which took 12 sec and this is the 10th render which took more than 17mins

PC specs: - CPU I5-3340 - GPU GTX 560ti - RAM DDR3 1333MHZ 16Gb - Motherboard MSI Z77A-G43 - OS Windows 7 ultimate

Ps: i got the Blur option turned on ofcourse and the shutter set to 1. no caustics and all light bounces set to 0 and samples set to 100 .

  • sorry this is my first post here. I forgot to mention that the second image was the 11th try and took more than 20 minutes, and if i restart blender the process also restarts. – A.dalvik Nov 24 at 17:18

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