Whenever i switch to the rendered view my whole PC freezes every so many seconds is there something not right in blender or is my PC just not up to it anymore?
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$\begingroup$ Even with the default scene? $\endgroup$ – Carlo Nov 9 '15 at 1:24
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$\begingroup$ Even with the default scene yes. My PC is roughly four years old now so i do believe it might be time for a upgrade? $\endgroup$ – Rei Nov 9 '15 at 1:24
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$\begingroup$ Is the whole pc freezed or just Blender's window? Since wich Blender's version did you experienced this problem? Are you using CPU or GPU? The average-4-years PC should be able to handle the default scene $\endgroup$ – Carlo Nov 9 '15 at 1:28
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$\begingroup$ Im using GPU render i will switch to the render preview it still work for about three seconds before freezing around about ten seconds and so on and so on. $\endgroup$ – Rei Nov 9 '15 at 1:32
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$\begingroup$ How does it respond to CPU? GPU might have issues IDK. $\endgroup$ – VRM Nov 9 '15 at 2:24
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It seems like your CPU/CPU can't handle the cycles render.
Cycles samples the scene as fast as it can, I think your computer freezes while trying to sample the scene:
(You can find this at the top of the 3D view.)
I suggest trying a simple scene and see if stop freezing the scene. If it doesn't, I believe there is a problem with your CPU/GPU or it is not supported for Cycles.
It may just be a problem with selecting the wrong computing device. If you have a supported GPU you can select it like me under User Pref > System:
And then selecting GPU under the rendering tab:
And if that still doesn't work, try selecting the CPU instead.
And if all that fails, I recommend getting a better GPU/CPU. You can compare and find the best one for your price here: http://olivieramrein.com/2012/02/25/blender-cycles-best-hardware-using-the-benchmark-spreadsheet-analysis/
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I just experienced this, and in my case it has been caused by having 5x View-mode subdivision on a UV sphere. Probably not what caused it for you, but this info might help someone else.
