Performance & Intrusion notifictions

Volume  Performance & intrusion notifications have seemed to mushroom.  Don't know if I hit some setting to increase them. Anyway, the Performance Notifications always reference something I've never heard of and stresses me out--like the "Check Engine" light in the car---- because something may be wrong and I have no idea what to do anyway.  (senior citizen denial).  Is there a setting to cut these multi-notices to ones that are really serious?  I ran NBE and have no risks at moment.  (As High CPU message pops up, I'll sign off)