The TiVo platform allows for upto 3 x V6 and then one additional TiVo, per home.
So no, you can't swap the TiVo for a V6 although I can completely understand why you'd want to!!
All I can suggest is the standard reboot to make sure there's nothing clogging it up more than is necessary. TiVo's were never known for being quick compared with the V6....
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