>Robert Purves wrote:
>
>> Rick Brown said:-
>> >Sending the same drawing commands to an offscreen GWorld would not speed
>> >things up, I think.
>>
>> Reluctant as I am to disagree with Rick, a direct comparison shows the
>> answer to be "yes, and by a substantial factor"  ---   4-5 times faster (on
>> an iMac). See the comparison program below.
>
>This is interesting.  I too found the GWorld draw to be faster (by a factor of
>almost 3 on my G3).  Here's a speculation:  When drawing to screen, QD surely
>has to check the current status of the clip region and vis region before
>_each_ drawing command.  But since those regions never change in a GWorld, QD
>shouldn't have to perform that check.  Maybe that's enough to accont for the
>speed difference.
>
>Thanks to Robert for providing actual experimental results!
>
>- Rick

I ran the demo a couple of times and there was only a 2 or 3 "tick"
difference on my G3/266


Pete...