weird lag in new update

in  the new update my mc w10 lags where sometimes I have to shutdown my computer even the mouse I cant move and that only happens after I sign in to xbox, in the old update before the 1.5 it was normal and it didnt lag like that I thought it was because of the realm I created because I created my realm in 1.5 so then I decided to create a new xbox account I thought that will help but nothing is working.