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<blockquote data-quote="SciDoctor" data-source="post: 934648" data-attributes="member: 11346">Thanks that crossed my mind after I had posted it . (length -1)&nbsp;Do yo think ATI handling is different to NV with DWM, this would explain a seperate issue with the standard dshowhelper.dll and triggerinng the ATI VSYNC rules on return from power saving events. Your dll 675 doesn't suffer this; does it reinitialises everytime it is envoked ?&nbsp;From what I remember the ATI vsync rules are harsh; if desired refresh/fps is less than monitor refresh and greater than half monitor refresh then fps are forced to half monitor refresh.ie. 60fps refresh monitor and you try 50fps playback media then 30fps is forced.&nbsp;A very old thread I had here&nbsp;<a href="https://forum.team-mediaportal.com/threads/very-poor-video-fps-after-powersave-s1-s3-and-turn-off-monitor.99965/page-2#post-931780" target="_blank">https://forum.team-mediaportal.com/threads/very-poor-video-fps-after-powersave-s1-s3-and-turn-off-monitor.99965/page-2#post-931780</a>&nbsp;Was all but ignored at the time, most devs and testers had NV cards and not ATI.</blockquote>

[QUOTE="SciDoctor, post: 934648, member: 11346"] Thanks that crossed my mind after I had posted it . (length -1) Do yo think ATI handling is different to NV with DWM, this would explain a seperate issue with the standard dshowhelper.dll and triggerinng the ATI VSYNC rules on return from power saving events. Your dll 675 doesn't suffer this; does it reinitialises everytime it is envoked ? From what I remember the ATI vsync rules are harsh; if desired refresh/fps is less than monitor refresh and greater than half monitor refresh then fps are forced to half monitor refresh. ie. 60fps refresh monitor and you try 50fps playback media then 30fps is forced. A very old thread I had here [url]https://forum.team-mediaportal.com/threads/very-poor-video-fps-after-powersave-s1-s3-and-turn-off-monitor.99965/page-2#post-931780[/url] Was all but ignored at the time, most devs and testers had NV cards and not ATI. [/QUOTE]

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