Then use the 10 year old version! Unless, of course, one of those few "actually useful features" is something you can't live without.
A lot of people use Word for a lot of use cases. The value of an added feature that someone needs always trumps the performance cost of adding it until the performance becomes so bad that it becomes the reason that other people stop using it.
It's weird how new trends in UX design try to make a first-time user become a genius immediately after double-clicking on the program icon. The only way you can do that is by dumbing down the software to the point it can actually be comprehended this way - which makes it much less usable and effective as a tool.
Maybe yours was faster, but I think a lot of people have rose-tinted memories of the speed of applications in the old days.