This seems like an incredibly low bar to hurdle. FB Messenger on iOS is legendarily bloated. In the couple of weeks I had it installed it also managed to be the biggest battery drain on my phone, even more than some 3D games.
Aren't those using Electron?
tl;dr web clients are probably more performant than their electron counterpart
It may have been slow and bulky before that, but that's when I started to notice.
It's unreal, our industry has lost its mind.