Imagination PowerVR SDK Blog

Slow Rendering on PC


#1

I've updated the SDK after quite a while and was pleasantly surprised by the GUI tool window. Very nice!

However, I experience very slow rendering now. With the old SDK my (very simple) test app was running at >2000fps on my PC. With the new SDK it runs at frame rates between 3 and 60fps, depending on which hardware profile I choose (only MBX lite works at 60fps, everything else is much slower).

The CPU usage is very low, so I don't understand why the frame rate is that low.

Thanks,
Daniel


#2

This is something we’ve seen inconsistently here, but haven’t nailed down the cause. As you’ve possibly gathered, VFrame runs over your native graphics card; what card are you using? Which drivers? Are you running in a window (640x480 forinstance)? Are you using multiple monitors?



#3

My computer is a notebook with a Quadro FX 3700M with the latest official drivers from Dell (mid of this year) on Windows 7.

The application runs in a 640x480 window on a single screen setup.


#4

I have possibly the same issue with certain demos on my work machine. Do you have this problem in other demos - how about the ones in the SDK?





I find if I restart then it goes away for a period. It is quite annoying, but this is the only work-a-round I have at the moment. I’m running an nvidia card atm too and this behaviour has not been shown on other vendors’ cards. I will post further if I work out more.