|Or... you're trying to playback footage that has a datarate higher than your hard drives can sustain. |} * Wil Renczes said: {| border="0" style="background:#efefef;" |Hmm, give this a whirl: under Preferences - General, try to flip the 'Optimize rendering for:' option to Memory instead of Performance.Since a lot of people wonder what's the story with this option: this setting controls whether we limit the number of render threads to match CS2, or whether we let it use more threads, depending on how many processors are available. This generally means better performance, but for every render thread, this means that we also use more memory, and it also means that we're accessing source material more frequently, so it can also translate into more disk activity.(My theory is that maybe wi