Hello. I've been having an issue when rendering AVCHD to Blu-ray in Vegas pro 11. One time it will render at faster than real-time, the next taking almost twice as long. I've triple checked that All parameters are set the same with the same type of codec, effects, etc. When rendering it will start off flying through the frames, then it will start to do spurts of frames, slowing down as it goes. The drives are defrag'd, Resource monitor shows it's using about 45% of cpu, plenty of available memory, not taxing the drives. I am on a Dell T5500, dual xeon, 12gb ram. Windows Pro 7. It's seems it has done this from install a couple years ago. I wasn't doing much Blu-ray till recently. Any suggestions would be appreciated.