Editor Console window has poor performance with 1000+ lines in window

[Kalmalyzer]

When there are 1000+ lines visible in the window, and a new Debug.Log occurs, the Editor will hitch noticeably.

Scrolling up/down does not make it hitch. Debug.Log when most messages are filtered out (by enabling the message filter in the top-right corner of the window) does not make it hitch.

[Kalmalyzer]

Side note, Unity's regular console window does not hitch in this manner.