Firstly choose the correct Bugs forum, according to the application you are using (Designer/Photo/Publisher), and the Operating System you are using. In that forum state the following
Hello there, I am now using the latest version of Designer and it remains sluggish and my tools keep crashing.
Can you reproduce it? Yes, It might have happened at least 6 to 7 times in the last hour.
Does it happen for a new document? If not do you have a document you can share that shows the problem? Yes, a new document where I am trying to make a vector portrait.
What is your operating system and version (Windows 10, OSX Mojave, iOS 12 etc)? Windows 10 x64bit. I am using a Cintiq 13ux.
What happened for you (and what you expected to happen) Whether it's with the vector shape tool or the brushes, it stops responding after a while.
Here's a clip of what keeps happening. I have the feeling it has something to do with rotating my canvas, but I am uncertain about this.