On 2/22/2016 3:04 PM, 'John Clements' via Racket Users wrote:
I have several students who are observing truly impressive UI delays in using
DrRacket. Specifically, it often happens when they type a double-quote (“) with
“automatic parentheses” enabled, and after typing the key, it will take more
than 16 seconds for the screen to update and for the quotes to appear. The
delay seems to be shortened significantly by clicking or hitting the arrow
keys, and I suspect this may be related to OS X’s “app nap” feature, that will
shut down an application when it thinks that it doesn’t need foreground
processing.
Any ideas?
John
Possibly this is a stupid question [ I don't have an OSX machine handy ]
...
If you suspect App Nap, have you tried disabling it for DrRacket?
http://osxdaily.com/2013/10/29/disable-app-nap-per-application-mac-os-x/
I know this might be a logistics nightmare in a class or lab.
FWIW, I also have observed some randomly impressive delays. In my case
they seem to happen when DrRacket has been running for a long time with
multiple windows. The condition (whatever it is) just seems to clear
itself after the freeze - sometimes a console window with an error pops
up but DrRacket keeps running.
I tend to restart DrRacket if the error pops up, but in any case it may
be hours or days before it happens again. However, I'm still on an
older version (6.1.1) so it might be fixed in more recent versions, and
so far it has only been a minor annoyance.
George
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