I have an iPhone SE (original) running iOS 14.2. Since the app update, it's very slow. Works fine on my MacBook. I like to write text on my Mac, then open up Evernote on my iPhone to copy/paste into Instagram. Takes a long time to 1) update notes, 2) get out of a note so that it can update, 3) scroll. Often, I quit the app in hopes that it will when I relaunch.
Also, it takes several seconds for the select option to show up. When I select text, I also have to wait several seconds before the cut/copy option appears. I just counted - about 6 seconds.