I can confirm that with iinet and ADSL2+ I haven't encountered any issues yet, though, I man using a Laptop as a wireless bridge between the TiVo and my main network.
As Darren has asked, how is your TiVo connected to your network?
and an additional question I will ask is, what happens if you disconnect your TiVo from your network when the "slowness" occurs? does it speed up again?
Ex Tivo Owner.
Philips Tivo
Version 1.3 Emulator Image from Minnie
200Gig Western Digital HDD
No Turbonet or Cachecard
Slices: Cable Digital FTA
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