possible.

For anyone who has the same problem as author and me and reads this article, I am leaving a sample image and a link to the uploaded package.

Although this post is 5 years old, I am leaving a reply. I also tried matplotlib, but it was slow. And I tried pyqt, pyqtraph, and finplot like you, but they were faster than matplotlib, but slower.

I was wondering whether to try a language other than Python, but I went back to matplotlib and tried something new. And it was successful.

I created a fast candlestick chart without using pyqt. And this can also be used in connection with tkinter.

https://pypi.org/project/seolpyo-mplchart/