EEvee make my computer too slow, mini freezes

When I use use Eevee, every click I make take lot of time to execute ( mini freezes) , even with a very small scene. Whereas with cycles my system is very quick.
My system is : i-7 3770 @ 3.4 GB , 3.4 GB- 64bit- RAM 6 GB, NVIDIA geForce 620.
I have noticed my property bar icons are not colored, Am I using an old version of 2.8 ? But even after downloading a reistallaing this morning, those icons remain grey, unlike what I see on youtube video.
Thanks for your assistance to solve my issue.