_blank target ui rendering problem

[ionicDev1]

I am using themeable browser to open a web page from an ionic 3 app. The page which I open has a alphascroll component which is similar to https://github.com/rossmartin/ionic2-alpha-scroll. If I open the page using the themeable browser target as _blank, when I scroll through the alphascroll to move up and down the lists in alphabetical order, there is a noticeable lag in updating the list and after few scrolls the list goes blank. If I use the targert option as _self or _system the scroll works perfectly. Does anybody know why these rendering issues are seen with the _blank target?