On Thursday, November 16, 2017 at 6:56:00 PM UTC-5, johnbclements wrote:
> Since the release of 6.11, it appears there’s been a major major 
> performance regression in the display of 3d plots in the interactions 
> window. 
> To see this, try running this program (from the plot docs), then try to 
> drag the image around. 
> On a fresh download of the snapshot, dragging is unusable; you can click 
> and drag, but all you’ll see is frantic GC. Sometimes, after releasing the 
> handle, the display updates. This problem does not appear to be present in 
> the released version of 6.11. 
> Also, FWIW, this is running OS X High Sierra, just upgraded about a week 
> ago. 
> Also possibly related; I’ve been having serious trouble running programs 
> that display long (200-300 lines) blocks of text in the interactions 
> window. I’ll see (say) twelve and a half lines of purple output, then wait 
> for three seconds, then another few lines of output, wait a few seconds, 
> etc. etc. 
> I’d be happy to submit this as a github issue…would it go into the 
> racket/drracket repo, or the racket/racket repo? 
> John 
> #lang racket 
> (require plot) 
> (require (only-in plot/utils bounds->intervals linear-seq)) 
> (define (norm2 x y) (exp (* -1/2 (+ (sqr (- x 5)) (sqr y))))) 
> (define x-ivls (bounds->intervals (linear-seq 2 8 16))) 
> (define y-ivls (bounds->intervals (linear-seq -5 5 16))) 
> (define x-mids (linear-seq 2 8 15 #:start? #f #:end? #f)) 
> (define y-mids (linear-seq -5 5 15 #:start? #f #:end? #f)) 
> (plot3d (rectangles3d (append* 
>                          (for/list ([y-ivl  (in-list y-ivls)] 
>                                     [y  (in-list y-mids)]) 
>                            (for/list ([x-ivl  (in-list x-ivls)] 
>                                       [x  (in-list x-mids)]) 
>                              (define z (norm2 x y)) 
>                              (vector x-ivl y-ivl (ivl 0 z))))) 
>                         #:alpha 3/4 
>                         #:label "Appx. 2D Normal”)) 
I am on the latest High Sierra beta (10.13.2 Beta (17C79a))...and I can 
drag the image created without any issues. It's smooth to drag and 
everything updates when I am dragging it around. The only change I have 
made is that I set the default memory limit to 1024MB.


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