Loads Of Lag on both Realms and Servers

I always check for new updates and the newest update was said to get rid of the lag or at least destroy part of the lag and this hasn`t hapened,if it`s coming out that`s great but i`m not judging any of the admins of Minecraft like Notch.
If this could be fixed i`m sure everyone would love it and if you are making it happen i support you ^^