I've found the scene function frame_set to be very slow. Is there any functions to set the frame only on an armature/object ?
This is for an exporter where I advance the animation frame by frame.
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frame_set is a python function used to change the current frame, when you change the frame every object in the scene needs to be updated to reflect their location at that point in the animation. For a large scene this can take some time.
If you only want to see the armature movement you can hide all un-selected objects ShiftH and use AltH to show them again, you can also go into local view, press Numpad / to toggle local view. By not having most objects visible can speed things up.