Many function in Vecci do not work with "ok'ish" vectorlists. What makes a vectorlist only ok'is?
any one of the following criteria makes a vectorlists at best "ok'ish"
not ordered or only partialy orderd
some vectors are not connected or form only small "paths"
the directions of connected vectors are in opposition
all vectors have a length smaller than 127/128 (depending on the sign)
These vectors can only be exported to "synced" list.
Depending on the purpose of such a list - the format might still be usefull. A synced list can be used to draw very large vectorlists which do not show signs of drift.
To scratch some performace out of this format see that as many "sections" of such a vectorlist are "good" vectorlists as possible.
You can check that by using the button under the tab: "build animation" → tab: "Scenatio" → button "seperate paths as scenario entries".
The number of such generated scenario entries represent the minimum numbers of syncs a synced list needs.
Try to edit the vectorlist so that as many "sections" are "good" or "perfect" - and thus that there are as few as possible "scenario" entries.