Michel wrote on May 1^st, 2020 at 8:25pm:

The speed restriction of 250/10000ft is only set during climb, it is on VNAV CLB page. When the plane reaches the desired cruice altitude, preselected on PERF or VNAV CRZ page, it changes his performance to the one entered on that page. It is part of the preflight to analyze and set the speed that you want to be set on cruise.

Or is this from real qorld experience? I know the 737 doesn't do that and the FMSs are somewhat similar.