Hi, every time i use the copychat, i got hard fps drops from 117 fps to around 30-40fps, when i close the window the fps are back to normal.
And copychat highlight doest works.

Does this happen regardless of how much text is available in the text box?

no, it only happens on the general channel. no highlight and fps drops. For example, if I want to copy something from the combat log, there are no fps drops and the highlit works too.