I, too, am having typing latency issues in DrRacket in the definitions 
window. As Dave noted, the size of the window seems to be related to the 
issue, and, in my experience, it's not just an issue with the Definitions 
window. Both the Interactions window and even the following code snippet 
(taken from StackOverflow 
will have this same lag:

(define frame (new frame% [label "Simple Edit"]
                   [width 1800]
                   [height 1800]))
(define canvas (new editor-canvas% [parent frame]))
(define text (new text%))
(send canvas set-editor text)
(send frame show #t)

(define delta (make-object style-delta% 'change-size 14))
(send delta set-face "Menlo")
(send text change-style delta)

I am on Ubuntu 17.10 using Racket 6.11 with the proprietary nVidia drivers 
and X.org. My GTK version is 3. I don't have this issue with any of the 
other text editors that I've tried to use.

I tried to profile the above text editor, but I am a novice Racketeer and 
could not figure out a way to profile a thread managed in racket/gui. Does 
anyone perhaps know of a way to hook the above into a profiler to see what 
might be the cause of this lag?

Has anyone happened to stumble onto this issue recently and solved it?


On Saturday, April 1, 2017 at 6:07:28 AM UTC-10, gneuner2 wrote:
> On Fri, 31 Mar 2017 13:34:38 -0700 (PDT), Dave Musicant 
> <musi...@gmail.com <javascript:>> wrote: 
> >I'm using DrRacket on a 64-bit Ubuntu 16.04 system with the 
> >default Unity windowing system, and am finding that typing 
> >in the definitions window is laggy. 
> I've seen similar behavior on CentOS 6.5-6.8 under Gnome(2) - it has 
> persisted across a number of OS and Racket versions.   
> I have seen the lag in Dr Racket with 6.1, 6.5, 6.7 and 6.8.  I 
> compiled 6.1 and 6.5 myself, so there might have been something 
> strange in those cases, but 6.7 and 6.8 were stock Linux x86_64 
> downloads. 
> Turning off background expansion helps somewhat, but I have found that 
> limiting memory seems to help the most.  On Linux I run Dr Racket with 
> the limit set to 512MB.  That might be too low for some people, but it 
> works fine for my typical (webserver app) uses. 
> George 

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