Hi there - I also have this issue on MacOS. The Evernote Helper process is spending way too many cycles on the CPU, and is affecting overall performance on my machine:
Macbook Air (13-inch, mid 2012)
MacOS Catalina 10.15.7
Evernote for Mac v10.4.4 build 2096 public
I've been shutting down Evernote when it acts up.