It's not LOL that's taking 98% of your RAM alone but the fact that all other process combined are taking 98% of your total RAM.
If, by example, you have 4GB of RAM, a simple calculation on that list would imply that you're using aprox. 3,2GB of RAM which would be 80% from the total, so if you have any other processes down that list as well, and including OS usage and RAM limitations ( You may have 4GB but normally the system don't use all of it ), you're pretty much close to the total, therefore the percentage is somewhat accurate.
If you want this to go down, you have two options. Close applications that you're not using to save up memory or get more RAM