IE 11 Set Max number of tabs

Hey Everyone!

I need some help!
I have about 200 computers with in my company that i manage. Everyone is complaining the the commuter is running slow! After researching it and looking at each computer 99% of them wold have 3 to 5 ie browsers open at a time with abut 9 to 15 tabs each (some less). I would like to manual set the max number of tabs to say no more then 10.

I found something on line a while back that told me how to do this in ie 10 but i can not find it now.
If i remember right they had to change a value or add something to the registry using regedit.

Can anyone help me out.

Thank you in advance!

NOTE: 99% of these computers are windows 7

Might see if a couple of choices here might help:

for starters check off always open popup in new tab,this might eliminate the multiple browsers ,and keep it to one IE11 opened ,with multiple tabs .haven't see a setting to limit the #of tabs opened but still looking