the .etl file shows 1 spike caused by the NDIS.sys: Total = 130696 for module ndis.sys Elapsed Time, > 256 usecs AND <= 512 usecs, 56, or 0.04% Elapsed Time, > 512 usecs AND <= 1024 usecs, 1, or 0.00% Total, 130696 Also disable all effects in the sound options, becasue the AudioEng.exe causes some CPU usage (CAudioProcessor::ProcessEachAPO)