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<blockquote data-quote="davidf" data-source="post: 656712" data-attributes="member: 19484">I played with (hacking in) the WaitableTimer last night which dropped the CPU markedly (it also stuffed the timing owlsroost had got working as well) This gave a reduction the amount of polling and does seem to be accurate.&nbsp; The most sensitive thing seems to be the number of threads running under MMCS that seems to cause all sorts of issues if there are too many.&nbsp; I'll try and correct the timing again and see what it looks like at that point.&nbsp; I think it would be possible to get a very accurate timer (self correcting) running which could get to within 1 ms of any point in the raster display without too much messing around, at least if I ignore the renderer for now.&nbsp;&nbsp;I'll use that tool which was posted and have a look - although from messing the timing quite a few times last night I'm betting on the CPU.&nbsp; robyf's dual core is working fine whereas my single core can get stuttery but only when the Audio Renderer is added, the only difference in the 2 setups is the extra core on the 330 over the 230.</blockquote>

[QUOTE="davidf, post: 656712, member: 19484"] I played with (hacking in) the WaitableTimer last night which dropped the CPU markedly (it also stuffed the timing owlsroost had got working as well) This gave a reduction the amount of polling and does seem to be accurate. The most sensitive thing seems to be the number of threads running under MMCS that seems to cause all sorts of issues if there are too many. I'll try and correct the timing again and see what it looks like at that point. I think it would be possible to get a very accurate timer (self correcting) running which could get to within 1 ms of any point in the raster display without too much messing around, at least if I ignore the renderer for now. I'll use that tool which was posted and have a look - although from messing the timing quite a few times last night I'm betting on the CPU. robyf's dual core is working fine whereas my single core can get stuttery but only when the Audio Renderer is added, the only difference in the 2 setups is the extra core on the 330 over the 230. [/QUOTE]

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