Earlier quoted context omitted.
It might even be, that the developers do not own a Windows machine. Did you ask them, whether they have one to test on and reproduce the slowdown? Or perhaps offer to buy them one? It is a pity that things slow down for you on Windows, but I don't really see, how it is their responsibility to cater to a proprietary system, that is actively hostile to its users. Preferrably it wouls not slow down for you, ofc, but the…
I appealed to them in concrete terms at one point not long before the release of 1.0: either fix things for Windows, or keep on recommending the 0.92 series for Windows. There’s no denying that for the 1.0 release Windows was a second-class citizen. There’s no reason why they couldn’t then say: “look, 1.0 is available, and if you want the new features you can use it, but it’s considerably slower than 0.92 and the Win…
I used Inkscape on Win10 recently, and also on Kubuntu (21.04 a and 21.10, I think) and the experience was comparable.
I do not like the icon themes now, they're very low contrast and difficult to decipher for me so use the old, colourful icons I'm familiar with. Apart from that and one problem with a dialog not appearing until I selected the option a second time (the XML dialog), all worked well.
I think it's difficult, a x.0 might not be snappy, might even have serious issues, but there's not enough manpower resource to address everything at once, it's going to be incremental. Holding things back would negatively impact the momentum of the project IMO, but yes may benefit an individual.