Too many people think that to read a PDF document, you need Adobe Reader. PDFs are standard these days, but there are also non-standard readers out there.
Reader is a good tool, but it has bulked up over the years, making load times extensive. Because of the load time, it also leaves parts of itself resident in memory, even when you have closed the program, to make startup the next time faster.
FoxIt Reader is an alternative to Adobe Reader that I use on all my computers. It is lightweight, fast, and clean.
If you are looking for an Adobe Reader replacement, check out FoxIt at FoxItSoftware.
This article was not solicited, and I am in no way affiliated with FoxIt. I’m just a very satisfied customer.