Closed fredowski closed 7 years ago
Yes, I'm afraid this is a somewhat known issue. Unfortunately none of the suggested fixes we've found so far have worked.
It also happens on all Macs, not just high resolution displays.
This should be fixed in 41a0c151c554a37fbffece8ef36848ed47fd17d3.
Hi,
i looked at XCode Instruments to see where the CPU cycles are consumed in the vncviewer process. I wanted to check if I can see a difference in the jpeg vs. jpeg-turbo build. I see roughly 20% of the load going to jpeg decoding, while 80% is spend more or less in writing the image to the screen. So on Mac the jpeg decoding seems to be a minor problem compared to image writing. I run this on a MacBook Pro with HighResolution Display - so maybe something is converted there...
Here is a screenshot showing the Main Thread vs. one of the worker threads with jpeg decoding:
Here is the first part of the main thread:
and here is the remaining part.
60% of the total CPU power for vncviewer is spend in the OS routine: argb32_image_mark_RGB24.
Googling seems to show more problems with this: http://stackoverflow.com/questions/21665473/coregraphics-argb32-image-mark-rgb24-is-slow
Friedrich