I usually have a lot of folder tabs open in DOpus, and I like to have folder size calculation enabled. That means, however, that all folder tabs have their folder sizes calculated in the background on startup, even though I might not use that tab at all. This can be quite cpu intensive on a laptop.
It would be nice to have an extra option "Calculate folder size only for selected/active folder tabs" or something similar. This would also mean that when changing to a new folder tab, the folder sizes would then be calculated for that tab.