Dragging a windows over Notepad with a document loaded causes the top windows to move slowly

When Notepad is open and the text file has a lot of text so the user needs to scroll around and another program is moved over it, the top window starts to slow down and jerk around.

To reproduce:

1) Open up freeldr.ini in Notepad
2) Open another program like Calculator or Explorer
3) Move around Calculator or any other program other than Notepad above Notepad
4) Profit

Debug log:

fixme:(dll/win32/shell32/shlexec.cpp:1774) flags ignored: 0x00104000
WARNING: NtUserNotifyProcessCreate at win32ss/user/ntuser/ntstubs.c:637 is UNIMPLEMENTED!
(win32ss/user/ntuser/painting.c:818) err: PAINTING BUG: Thread marked as containing dirty windows, but no dirty windows found! Counts 1
(lib/rtl/actctx.c:1395) Unsupported yet language attribute ((null))
(lib/rtl/actctx.c:2395) unknown element trustInfo
err:(win32ss/user/user32/misc/dllmain.c:399) HACK: Hackish NtUserProcessConnect call!!
err:(win32ss/user/user32/misc/dllmain.c:421) HACK: Using Init-ClientThreadSetupHelper hack!!
err:(win32ss/user/user32/windows/window.c:471) CreateWindowExW RegisterSystemControls