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I was working on a simple project with a single model, a backdrop and lamps, and suddenly, Blender became really, really slow. I tried starting a new project, restarting the computer, even reinstalling Blender, but nothing seems to help. What could have happened and what can I do to resolve it?

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  • $\begingroup$ I’m not sure but you may be having the same problem I and several other people have run up against in the last few days. I just uploaded my post Blender running at a crawl after NVidia update. Look it over and go to the Blender URL listed for more info. Sorry this is not a fix, but I have some tickets out and will update when I get some answers. $\endgroup$ – Steve King Feb 17 '17 at 0:18
  • $\begingroup$ @Marijn Tulp, Steve King has posted his solution here: blender.stackexchange.com/questions/73818/… .... $\endgroup$ – Edgel3D Feb 18 '17 at 0:56
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I am doing a Udemy Blender training and there they advised to do a forced update of display drivers. This appeared to be the cause of my problem, because since I rolled back the driver update, it works perfectly again.

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I recently ran into the same problem. I found this similar one Blender 2.78 with Windows 10 lags when interacting with the UI, which seems to indicate a problem with Windows 10, which I was running. But I found that the solution was to right click on the blender shortcut>Run with Graphics Processor>Integrated Graphics. Mine immediately went back to running fast when I did this.

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