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GUICtrlSetBkColor - 10 times slower after graphic creation


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Hi All,

I have discovered something odd and am unsure how to counter it.

I am using labels (for BkColor) to act as coloured borders for richedit controls (for coloured text).

When loading a number of items  (50 for example) there is a noticeable delay, after troubleshooting this is down to GUICtrlSetBkColor.

Normally GUICtrlSetBkColor() is really fast <0.5-0.7 MS but when i load my grid (using graphics) this slows down to 5-5.5MS.

In the above case this is adds a 250ms delay vs 25ms without the grid.

Example Code.

#include <GUIConstantsEx.au3>
#include <StaticConstants.au3>
#include <WindowsConstants.au3>

local $iDiagramWidth = 664, $iDiagramHeight = 498
local $iDiagramPadding = 8, $GridSize = 16

GUICreate("Example", $iDiagramWidth, $iDiagramHeight+$GridSize, -1, -1, -1, $WS_EX_COMPOSITED)
    $hGraphic   = GUICtrlCreateGraphic(0, $GridSize, $iDiagramWidth, $iDiagramHeight, BitOR($GUI_SS_DEFAULT_PIC,$WS_BORDER))
    $hLabel     = GUICtrlCreateLabel("Example", 0, 0, $iDiagramWidth,$GridSize)


MsgBox(0, "Msg", "Click Ok to start")


MsgBox(0, "Msg", "End of Demo")

While 1
    Switch GUIGetMsg()
        Case $GUI_EVENT_CLOSE


Func AvgBckColorChange()
    ;Timer to change BCKColor of Label 10 times
    $Test = TimerInit()
    For $i = 1 to 10
        GUICtrlSetBkColor($hLabel, 0x00000 & $i)
    MsgBox(0, "Msg", "Avg time to change color 10 times " & TimerDiff($Test)/10)

Func CreateGrid()
    ;Create Grid
    $iWidth = Floor(($iDiagramWidth - ($iDiagramPadding * 2)) / $GridSize)
    $iHeight = Floor(($iDiagramHeight - ($iDiagramPadding * 2)) / $GridSize)

    GUICtrlSetGraphic($hGraphic, $GUI_GR_COLOR, 0x000000)

    $icount = 0
    For $iH = 0 To $iHeight
        For $iW = 0 To $iWidth
            GUICtrlSetGraphic($hGraphic, $GUI_GR_PIXEL, $iDiagramPadding + ($iW * $GridSize) - 1, $iDiagramPadding + ($iH * $GridSize) - 1)
            $icount += 1

    ConsoleWrite($icount & @CRLF)

    GUICtrlSetGraphic($hGraphic, $GUI_GR_REFRESH)


I have a bloated workaround (see below) but wondered if the orginal issue can be fixed or if i am using graphics* incorrectly.

  • Load the grid in a separate $WS_POPUP GUI
  • Screencapture the GUI in memory (as the script will not have write permissions)
  • Apply the $hBitmap to a PIC control
  • Delete the $hBitmap, graphic & GUI

*I am aware the more added to a graphic can slow it down but this should be around the 50k mark, My grid is only 1,250.

Edited by IanN1990
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  • IanN1990 changed the title to GUICtrlSetBkColor - 10 times slower after graphic creation

I tested your script and in my case it is about 3 time faster after graphic creation.

I must admit I tested it on Win7 without DWM (classic theme).  If you are running it on win10, then you cannot disable totally DWM, that might be the reason of the slowness.


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  • Solution

Hi All,

After more research i came to understand each pixel was an object within the graphic. I thought if i reduced the number of total objects this would fix the issue.

Instead of a dotted grid, I would created a line-grid (see below) which ended up having 72 objects and a big improvement but a noticeable delay remained.

GUICtrlSetGraphic($hGraphicDiagram, $GUI_GR_COLOR, 0xCACACA)

    For $iW = 1 To $iWidth
        GUICtrlSetGraphic($hGraphicDiagram, $GUI_GR_MOVE, $GridSize * $iW, 0)
        GUICtrlSetGraphic($hGraphicDiagram, $GUI_GR_LINE, $GridSize * $iW, $iDiagramHeight)

    For $iH = 1 To $iHeight
        GUICtrlSetGraphic($hGraphicDiagram, $GUI_GR_MOVE, 0, $GridSize * $iH)
        GUICtrlSetGraphic($hGraphicDiagram, $GUI_GR_LINE, $iDiagramWidth, $GridSize * $iH)

Unlimitedly the solution came from using GUISetState(@SW_LOCK) and GUISetState(@SW_UNLOCK) while updating the controls.

Edited by IanN1990
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