Slowly editing large notes

[Bielefeldt 3]

On my Samsung Galaxy S9 +, I experienced in the summer of 2020 that large notes suddenly from one day to the next became very slow to start editing.  

Small notes work fine, but large notes that I use for diary and the like can take 45 sec.  to open for editing.  But it is quick to open for view.

I was hoping it was a bug that was automatically fixed, but now it has lasted at least 4 months.  

Is there anything I can do. It's very frustrating to edit large notes ?