On Tue, Apr 22, 2014 at 5:50 PM, Matthias Felleisen
<matth...@ccs.neu.edu> wrote:
>
> On Apr 22, 2014, at 5:42 PM, Daniel Prager <daniel.a.pra...@gmail.com> wrote:
>
>> Matthias: Would it make sense to have an option on (big-bang) for it not to 
>> redraw if the world hasn't changed?
>
> The world library does this. NO, all the code that did this is commented out. 
> The comment next to it says "Robby optimization" and I totally forgot why it 
> says so. I do recall running into problems with not refreshing the image and 
> that not refreshing was actually not big time saver. Sorry for the double 
> negative.

You appear to have removed this optimization in this commit:
https://github.com/plt/racket/commit/be76ed2adde49ed07453b368bc254c3bce99259d
but without a reason given.

Sam

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