The fact that it's not a universal issue is irrelevant - it's a consistent issue that is well documented and has affected many users for the past 19 months. Here's some conclusions we can draw from evidence:
There was a version of Evernote in which this was not an issue. Now it is. This suggests this is a problem with the client, and not people's hardware.
There is a current workaround that severs Evernote's connection to the internet, and many people in the thread I linked in my above post have reported that this solves the slowdown issue, once again suggesting this is a problem with the client.
I can consistently edit and render large files on Adobe Premiere Pro and After Effects on my computer, both of which should be more intensive actions than opening a note in Evernote, yet the former causes no lag or slowdown, and the latter does. Just how much juice does a notetaking app need?
The slowdown issues are not present on the Mac client, so unless they are vastly different software for some reason, it seems this is a bug in the Windows client of Evernote in particular.
All of the above is why I describe anyone's attempts at trying to scapegoat an affected person's machine in respect to this issue as a "con." The fact that EN is constantly full of bugs and every new update seems to bring new ones also leads me to have little faith that this is anything but a client issue.
As for why I posted it in multiple threads, the fact that it's been 19 months and there's not even been a peep from Evernote staff about the issue is disgraceful. Several people have reported that EN has been rendered unusable to them because of this issue, yet the priority seems to fall to frivolous things like emoji support. My posting in multiple threads is simply to draw attention to this issue, and EN's lack of response. It helps the community at large because it draws attention to the problem, and if it is ignored, it draws attention to how EN chooses to handle user concerns. People can draw their own conclusions after that, but I frankly expect more from a service I pay for. Your comment, on the other hand, seems to be trying to detract me from mentioning an issue that has affected many users, and keeping quiet about bugs not only doesn't help the community at large, it negatively affects it. Yes, you are fortunate that it doesn't affect you, but just because you aren't affected doesn't change the fact that many users are.