It's still related to processor load then though, either something resource intensive is starting up or is spiking at that moment, or your system is throttling itself to either try and remain within safe temperatures or to save power. If you're using any of the filters then those are most likely to have the largest impact on performance.
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Intel Core2Quad Q9550 (2.83Ghz stock) | ASUS P5Q | 2x2GB Transcend JetRam DDR2-800 | ASUS ENGTX260\HDTP\896M | Windows Vista Home Premium 64bit SP1
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