I have two workstations with the same configuration, with the same version of Premiere and the same project file. Why on the first workstation, can I preview the sequence without needing to render while on the other workstation to be able to preview the sequence, I need to render?
Because the workstations most likely don't have the same specs? From what I understand I assume that the other workspace runs slowly in preview or required you to pre-render the sequence in order to play it smoothly. In that case, check your ram, cpu and gpu and upgrade it accordingly. If that is not the problem at hand, please clarify what it is.