I can definitely confirm that I have a similar behavior.
I’ve used Windows 10 and upgraded to Windows 11. I think this was happening to me before with Windows 10, and it’s still happening with Windows 11, on the same machine. I even created a thread with a confusing issue related to this.
Apparently, in most cases, Renoise starts fast, plugins load at normal speed, and the LUA tools run fast, as usual.
But sometimes when you start Renoise, you notice that something is wrong. It loads slower and closes slower, and it also affects the loading of plugins and also some LUA tools take about 3 or 4 times longer to load (if it used to load in 0.5 seconds, now it takes about 3.5 seconds). This also affects the overall graphical fluidity of Renoise. Control becomes slow and choppy, both in Renoise and in the window Lua tools.
Apparently it only seems to affect Renoise, but I’d say it’s an issue between Renoise and Windows, affecting both Windows 10 and Windows 11 as well. Tested on the most recent versions of Renoise, 3.3.2 and next.
It’s frustrating because I have no way of figuring out what’s causing it. It just happens sometimes.
The only thing I can say is that in my case, it affects the loading speed and also the fluidity of the graphics.
While all of this is going on, I never touch any of the Renoise settings. Simply, sometimes it goes well, and a few other times it goes wrong.
I don’t think the internet connection and its use have anything to do with it.
I use an Nvidia graphics card with up-to-date original Nvidia drivers, and an Intel processor.