That reminded me of a time at work where some testing on our project required opening some large XML files. We were using Notepad++ to open them and format them so we could easily examine them. My boss complained about how bad Notepad++ sucked because it was sooooo slooooow to open.

I checked his computer and it turned out that while he would close Notepad++, he never actually closed the file tabs. So every time he opened a new file, it was adding to the hundreds of open XML files. He was literally opening several GBs of XML files every time he launched the app. Frankly, it made me even more impressed with Notepad++ because I would have assumed most other apps would've been crushed.