I have used Adobe Reader as my PDF viewer many years. But Adobe Reader became fatter and fatter recently. Today when I opened three PDF files with it, my computer became very busy and slow. I open the task manager of Windows. To my surprice, the Adobe Reader used over 100 MB memory space! So I wanted to look for another PDF viewer.
I found Foxit Reader just now. Many people think it's better than Adobe Reader because it's smaller and faster. I have tried it. Very fast even I open five PDF files. That's it.
The disadvantage of Foxit Reader is the font is not as clear as Adobe Reader. I don't know why it is.