ghci balkiness on OS X?

[Evan Laforge]

On my OS X, if I load a couple hundred modules into ghci as bytecode,
text entry gets balky and laggy.  So e.g. if I hold down a key, the
letters will stream in but have frequent hiccups.  This seems to
adversely affect haskeline as well, such that, using vi mode,
sometimes ^[ to move to command mode will be lost, or it will
spontaneously go to insert mode, or ^[ followed by 'h' will be just
beep and remain in insert mode.  If I load most of the modules
compiled, this doesn't happen, or at least is not nearly so bad.

It doesn't seem to be due to background work by ghci or anything,
because it doesn't matter how long I wait after loading the modules.
My previous random guess was that increased memory use made the GC
work more, and my pauses were due to major collections.  But when I
try on linux, ghci remains responsive no matter how many modules I
load, so maybe it's an OS X only problem.

Do any other OS X users see this effect?