I installed a glass vessel sink with a pop up drian it drains very slow how can I fix this

Hi Sspener...

A regular pop-up assembly will not work properly with a vessel type sink.

You need to purchase a vessel sink drain... see images. Best bet is to purchase a flip top or a pop-up (also called mushroom or umbrella type) drain assembly. These drain assemblies mix air with water at a ratio that allows proper drainage. The grid style, even though made for vessel sinks, is not a great choice as they just don't seem to mix the air with the water the way the others mentioned above do.

Go to home depot, Lowe's or menards and purchase the better style vessel sink drain and you will be up and draining properly soon... :)

Otherwise, please explain more about the pop-up assembly you put in... OK?

Mark