Slow performance on Big Sur

J. Landman Gay jacque at
Mon Dec 14 17:12:59 EST 2020

On 12/14/20 2:46 PM, Paul Dupuis via use-livecode wrote:
> On 12/14/2020 2:04 PM, J. Landman Gay via use-livecode wrote:
>> My client is running Big Sur and says that changing cards in a stack causes a very slow, 
>> stuttering display. The background image appears in chunks and text in the fields comes in as 
>> sequential pieces. The order of the display varies, sometimes the text appears first, 
>> sometimes the background image. The first few cards are fairly normal, but as she pages 
>> through the stack it gets slower.
>> I had her watch Activity Monitor and CPU usage goes up as she navigates through cards. At 
>> first the display is fairly normal but each successive card change increases CPU useage a 
>> little bit. She stopped when usage got to about 50% when she said it was unusable. This was 
>> in the IDE. She says the standalone is even slower.
>> Has anyone seen this? On Mojave and Catalina everything is fine.
> I had a weird display issue where a transition between two cards left with one card 
> semi-transparent behind the new card. It was also slow. I have a visual effect dissolve between 
> these two cards I removed the visual effect and changing between the cards was fast and clean.
> Examine any visual effect transitions you may have between cards.

Thanks. There are no transition effects, just "go card". Each card has an image, and I tried 
toggling off alwaysBuffer but that didn't help. CloseCard sends some data off to a server but 
by the time the card is rendering, that's done I think. Also, it's odd that the delay 
accumulates. If it was due to something in navigation it should happen all the time at the same 
rate, but instead it gets slower as you go.

Jacqueline Landman Gay         |     jacque at
HyperActive Software           |

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