I went through a recent experiment like this as well. Instead I installed Office 2003(The last of the old toolbar offices) on a clean Windows 10 system. I was looking to validate my theory about the speed and bloat of the new versions of Office. I just had this nagging feeling that the software wasn't as fast as old versions. It was confirmed. Using the old Office just felt so pleasant with how fast it loaded and simple it is in terms of cognitive load.