Details
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Bug
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Status: Open
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P1: Critical
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Resolution: Unresolved
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5.6.0
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None
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None
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Model Name: MacBook Pro
Model Identifier: MacBookPro11,3
Processor Name: Intel Core i7
Processor Speed: 2,8 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 16 GB
Chipset Model: NVIDIA GeForce GT 750M
Type: GPU
Bus: PCIe
PCIe Lane Width: x8
VRAM (Total): 2048 MBModel Name: MacBook Pro Model Identifier: MacBookPro11,3 Processor Name: Intel Core i7 Processor Speed: 2,8 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 6 MB Memory: 16 GB Chipset Model: NVIDIA GeForce GT 750M Type: GPU Bus: PCIe PCIe Lane Width: x8 VRAM (Total): 2048 MB
Description
The attached project opens 16 Qt Quick windows. Each is of them displaying a small (27kb) image which is rotated by an RotationAnimator.
I observe continuous frame drops. The animation is stuttering. With an increased windows size the issue already starts with 8 windows. CPU performance according to activity monitor is above 140%.
Note: profiling didn't point to any obvious scene-related hotspots. Animations frame-rate is 60 fps. I see a lot of time spent in the SG swap state. The graphics card should be able to draw these scenes without frame-drops.
Attachments
Issue Links
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- Closed
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Gerrit Reviews
| For Gerrit Dashboard: QTBUG-52372 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 168650,8 | Limit glyph caches per QFontEngine to four per context, not four in total | 5.6 | qt/qtbase | Status: MERGED | +2 | 0 |
| 168749,1 | Limit glyph caches per QFontEngine to four per context, not four in total | dev | qt/qtbase | Status: ABANDONED | 0 | 0 |