The main timing methods for categories is RTA, so naturally some consoles will perform better than others. You can see differences in this video for example:

Multiple saves on Series console by Orko - On your main profile got to - settings - General - personalisation - my home xbox then enable it. You will then be able to play unleashed on multiple profile meaning, you keep your saves.

Any% tutorial by Joshua Salkeld -

Infinite EXP abuse glitch in DR1 by Valyssa: