On my system I have 6 GB RAM.
Even when I have 10 apps open, EIS running a full system scan while I continue to test, and IE11 with 15 tabs open all while in Shadow Mode
...well, my system has never gone above 75% RAM !!
I stopped paying attention to EAM/EIS RAM usage as it doesn't affect my work load.
I only see RAM spike to about 250 to 300 MB for about 1 minute every hour during updates.
Other than that, I do not know EIS is there ... except when it alerts/auto-quarantines.
On my system, Emsisoft Internet Security is very dependable/reliable