Thanks for your reply Marco.

It happens regardless of text selection size.
It happens in the SQL Window and Command Window.
It does not happen when selecting text from a dataset cell.

When looking at my windows task manager performance tab, I see the CPU increase 5% to 7% when copying from the SQL/Command window, it sits at this for a few seconds. It'll only rise 1% to 2% when selecting the same text from something else (notepad for example) and drop back down instantly.