A procrastinator / delayer. In short, this term can be applied on one who delays or lingers. So, when you come across someone who postpones work (especially out of laziness or habitual carelessness). here is the term to categorize them.
Roman Statesman Fabius Maximus is surnamed as conctator for the same reasons as mentioned above.
Example
Now given cunctator’s style of editing, he may have been intending to remove that at a later point.