Selecting a big "group" is lagging because only one core is at 100% and all other are at 10%

If you group many lines (for example you are create a graph with it or so) and you move your mouse over the group its lagging like hell… because only one cpu core is used for selecting… and the  one core is at 100%

so would it possible to optimize the multicore support? :smiley:

i mean normal editing is using all cores… but selecting not?..

Here a Video what i mean: http://bit.ly/2nEWjo7