Every time I see an Inkscape update I skim it for "massive performance upgrades" and am invariably disappointed. Inkscape doesn't need features, it needs to not lag for 5 seconds when I open a menu, it needs to run at 100+fps when I'm editing paths.

EDIT: I installed the latest version (under W10) and while it doesn't degrade to bounding boxes it's still like 10fps and it leaves trailing copies of the item being dragged around the canvas while I'm dragging. Really disappointing.

For example, for the longest time, if you put the cursor in a text field and then hit cmd-A to select all text, it would interpret that to mean select all objects in the canvas instead. Another thing is that sometimes when I click and drag the corner of the window to resize it, the thing just won't budge. It takes several attempts before it actually works. Very frustrating, but it's open source and gets the job done for the most part, so it's very hard for me to move away from it.