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Hi Brecht,<br>
<br>
Just discovered an interesting issue, seems to have been introduced
since Blender changed to CUDA Toolkit 5.0. Not related to Cycles
render speeds, which consequently have received a great boost after
code re-factoring. Issue is connected with Viewport performance
after performing a Cycles render.<br>
<br>
<b>Issue outlined below:</b><br>
<br>
Upon opening a complex scene, with a heavy particle system
(particles Viewport setting of 1, Child particles 0), Viewport
navigation (VOBs enabled) with an Intel HD 4000 (part of i7 CPU) is
extremely fluid, like 30fps or more, (much slower on GTX 580 due to
double sided Normals restrictions).<br>
With recent Blender versions, everything is fine until a F12 Cycles
render is performed (does not happen with Viewport render), after
which Viewport navigation becomes extremely sluggish, feels like
2fps. Hiding the heavy particle object returns full Viewport
performance, once object is unhidden Viewport is back to a crawl.
Closing and opening Blender with the same scene and everything is
back to normal, until the next F12 render is performed.<br>
<br>
Blender versions prior to Toolkit 5.0 changes, Viewport performance
remains just as fluid after a F12 Cycles render, also tested Blender
2.67b. <br>
<br>
Today's BuildBot version (official) blender-2.67-r57660-win64
produces the sluggish Viewport issue after a F12 Cycles render.<br>
<br>
David <br>
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