I think wilco77 means the FMC Ref-speeds (which are a customer option I believe), not uplinked speeds. The FMC reference speeds are derived from runway elevation, weight, temperature, entered wind, aso just like the balanced takeoff V-Speeds in the performance inflight section of the FCOM. However, the EFB OPT will calculate improved climb speeds if possible, then you might see a large difference to the FMC calculated speeds.