The only way I can think of to speed things up is with to burn it as Bluray DVD type format disc or if your downgrade it to Standard DVD type format disc then it will be slow.
Option that may help are Graphics Video Accelerated Encoding
ATI Stream "AVIVO Video Converter, PowerDirector 7 Ultra" bear in mind that this only work with HD 4xxx Series and up
Nvidia CUDA "Badaboom, LoiLoScope, TMPGEnc, PowerDirector 7 Ultra"
Standalone Hardware Decoder/Encoder
Leadtek WinFast PxVC1100 Transcoding Card " there two Bundle Software option one with TMPGEnc or the one with Ulead VideoStudio 11 Plus, DVD MovieFactory 5.
Some other solutions but way over price and with same Toshiba Stream Processor SpursEngine Chip
Grass Valley FireCoder Blu
I would have added MotionDSP vReveal but it lacking in the output format the last time I check it was WMV and AVI only.