All the way back to 2015, I got a job that said "we have a page (in a Windows app) that loads in 5 hours; we'd like that to be much faster, preferably in under

All the way back to 2015, I got a job that said "we have a page (in a Windows app) that loads in 5 hours; we'd like that to be much faster, preferably in under a minute". I got it down to a few seconds, but that's not the important part: that was an application that was being used, daily. That page would just take 5 hours to load.