Created attachment 127078 [details]
cpu usage spike

i'm using krita next b1b691b and got 15% CPU usage whenever i opened the krita logs (stops after about 10 seconds)

-this makes all of krita lag

-fixed immediately when i close the window

-doesn't occur when viewing system info or any other text window

-100% reproducible

2 of my 8 cores are at ~60% during this time


my complete hardware info:

(i have an i7 6700 and an SSD which krita is installed to in case that's relevant)

Krita

 Version: 4.3.0-prealpha (git b1b691b)
 Languages: en_US, en, en_US, en, en_US, en, en_US, en, en_US, en, en_US, en, en_US, en, en_US, en, de_DE, de, en_US, en
 Hidpi: true

Qt

  Version (compiled): 5.12.7
  Version (loaded): 5.12.7

OS Information

  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 10.0.18362
  Pretty Productname: Windows 10 (10.0)
  Product Type: windows
  Product Version: 10

OpenGL Info
 
  Vendor:  "NVIDIA Corporation" 
  Renderer:  "GeForce GTX 970/PCIe/SSE2" 
  Version:  "4.6.0 NVIDIA 441.20" 
  Shading language:  "4.60 NVIDIA" 
  Requested format:  QSurfaceFormat(version 3.0, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile  QSurfaceFormat::CompatibilityProfile) 
  Current format:    QSurfaceFormat(version 4.6, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples 0, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 1, colorSpace QSurfaceFormat::sRGBColorSpace, profile  QSurfaceFormat::CompatibilityProfile) 
     Version: 4.6
     Supports deprecated functions true 
     is OpenGL ES: false 

QPA OpenGL Detection Info 
  supportsDesktopGL: true 
  supportsAngleD3D11: true 
  isQtPreferAngle: false 

Hardware Information

  GPU Acceleration: auto
  Memory: 16327 Mb
  Number of Cores: 8
  Swap Location: C:/Users/Til/AppData/Local/Temp

Current Settings

  Current Swap Location: C:/Users/Til/AppData/Local/Temp
  Current Swap Location writable: true
  Undo Enabled: true
  Undo Stack Limit: 75
  Use OpenGL: true
  Use OpenGL Texture Buffer: true
  Use AMD Vectorization Workaround: false
  Canvas State: OPENGL_SUCCESS
  Autosave Interval: 1200
  Use Backup Files: false
  Number of Backups Kept: 1
  Backup File Suffix: ~
  Backup Location: Same Folder as the File
  Backup Location writable: false
  Use Win8 Pointer Input: false
  Use RightMiddleTabletButton Workaround: false
  Levels of Detail Enabled: false
  Use Zip64: false


Display Information
Number of screens: 1
	Screen: 0
		Name: \\.\DISPLAY1
		Depth: 32
		Scale: 1
		Resolution in pixels: 1920x1080
		Manufacturer: 
		Model: 
		Refresh Rate: 60

Current Settings

  Current Swap Location: C:/Users/Til/AppData/Local/Temp
  Current Swap Location writable: true
  Undo Enabled: true
  Undo Stack Limit: 75
  Use OpenGL: true
  Use OpenGL Texture Buffer: true
  Use AMD Vectorization Workaround: false
  Canvas State: OPENGL_SUCCESS
  Autosave Interval: 1200
  Use Backup Files: false
  Number of Backups Kept: 1
  Backup File Suffix: ~
  Backup Location: Same Folder as the File
  Backup Location writable: false
  Use Win8 Pointer Input: false
  Use RightMiddleTabletButton Workaround: false
  Levels of Detail Enabled: false
  Use Zip64: false


Log:

================================================================================
SESSION: 29 Mar 2020 10:10:12 +0200. Executing C:\Program Files\Krita (x64)\bin\krita.exe

Krita Version: 4.3.0-prealpha (git b1b691b), Qt version compiled: 5.12.7, loaded: 5.12.7. Process ID: 1244
-- -- -- -- -- -- -- --
29 Mar 2020 10:10:14 +0200: Database is up to date. Version: Unknown, created by Krita Unknown, at Do Jan 1 01:00:00 1970