I recently purchased a second satellite receiver(RCA DRD450RG) so that I could have Dolby Digital. My other receiver (RCA DRD505RB) was purchased about 4 years ago +/-. The new receiver seems to be twice as slow as my old receiver when navigating the guide and switching channels and it's quite annoying. Is this normal? Has RCA comprimised speed for additional features in their receivers? Are there receivers out there that are quicker? One note I should add is that I got a great price on the receiver at Circuit City ($80) for dolby digital.