Cycles Taking 2 Hours to Render One Frame I am new to rendering with cycles (I usually just use internal), and am trying to render a particular scene with it. The scene does include an explode particle system and a smoke system, however they are still quite simple. Though I believe there must be something wrong with my setup, as it is taking about 2 hours just to render one frame at a time.
I have tried using GPU rather than CPU but it caused an error ("OpenCL build failed") so I ignored that option.

Computer details -

AMD A10-7300 Radeon R6, 10 Compute Cores 4C +6G 1.90 GHz

8.00 GB RAM

64 Bit Operating System

Windows 10





Any suggestions will be gratefully appreciated!

Michael.
You should turn off "Square Samples" unless you actually intend to square the number of samples being used (e.g., see https://blenderartists.org/forum/showthread.php?342753-Square-Samples for some insight into why you might want to square the samples).  For previewing purposes, you definitely want to turn it off.  And you'll probably want to bake the simulation so it doesn't have to calculate it every time you switch to a different animation frame.