Hello is 20Mib of addons memory a lot ? coz i really dont under stand this stuff coz if its i will get rid of some addons i got a huge lag in WG.

That depends on how powerful your computer is. 20MB is about half of what I run when soloing, but I have to turn non-essential addons off when doing 25 man raids. On any computer built in the last year or two (assuming it isn't a $500 POS) you should be fine. Judge yourself; if you are very laggy, turn off some addons that you don't need.

QuestHelper & Carbonite, Recount, some Cartographer plugins, these are all big addons that require a lot of work for the computer to process.