Details
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Bug
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Resolution: Out of scope
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P3: Somewhat important
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None
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5.8.0
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None
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Win7 64bit SP1 (with all patches as of 2017-04-13)
Intel i5-4590 CPU
Intel HD 4600 driver 10.18.14.4578 (could not install latest version though)
NVIDA GeForce 7600GS driver 9.18.13.908 (seems to be the latest)
Description
Starting Qt-Creator 4.3b1 out of the box (equivalent to QT_OPENGL=desktop) results in high CPU usage consuming about half a CPU core's performance (12% on my 4 Core system)
0 ntdll.dll!ZwRequestWaitReplyPort+0xa
1 dwmapi.dll!DwmSetWindowAttribute+0x1cc
2 dwmapi.dll!DwmSetWindowAttribute+0x3d0
3 dwmapi.dll!Ordinal132+0x97a
4 dwmapi.dll!DwmSetWindowAttribute+0x2cc
5 dwmapi.dll!DwmFlush+0x92
6 ig75icd64.dll!DrvValidateVersion+0x139a
7 kernel32.dll!BaseThreadInitThunk+0xd
8 ntdll.dll!RtlUserThreadStart+0x21
Using QT_OPENGL=software and QT_OPENGL=angle is both fine.
Tested with both 32bit and 64bit Version
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Issue Links
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