I use the Notes Writer app on my iPad Pro, and it's getting super slow when I use the Pencil. I restarted the iPad, deleted files so I have enough space. The problem still persisted.
Other apps such as Notepad+ are functioning properly with the Pencil.
What should I do?
Notes Writer and Notes Writer Pro just had recent updates.
I noticed some lagging in this app, as well.
You might have to do as I did and contact the developer of Notes Writer and, also, let them know about this issue.
There maybe something they missed or messed up in the recent iOS/iPadOS update.
Best of Luck to You!