I created several Custom pages as below. For each page custom function, do ‘nsdialog::Create~nsdialog::show’.

And call the LoadBannerImage function every few pages
Images are placed in fixed positions on each page.

I did lockWindow on~off, but every time I did next or prev button on the page The banner image is flickering and redrawing (including other controllers also blinking)

It is more visible in low-spec virtual machine environments.

How can I solve this phenomenon more naturally?

Page custom DisplayWelcomePage
Page custom DisplayInstallationDirPage LeaveInstDirPage
Page custom DisplayInstallReadyPage LeaveInstallReadyPage
!define MUI_PAGE_CUSTOMFUNCTION_SHOW InstallPage
!insertmacro MUI_PAGE_INSTFILES
Page custom DisplayInstallationFinishPage

;WelcomePage.nsi file

Function DisplayWelcomePage
Call LoadBannerImage

nsDialogs::Create ${WITHOUTHEADER_INTERFACE}
Pop $r0
SetCtlColors $r0 0 0xF5F5F5
Push $r0

nsDialogs::Show
FuncionEnd

; InstallReadyPage.nsi file

Function DisplayInstallationDirPage 
Call LoadBannerImage

nsDialogs::Create ${WITHOUTHEADER_INTERFACE}
Pop $r0
SetCtlColors $r0 0 0xF5F5F5
Push $r0

nsDialogs::Show
FunctionEnd

• loadBannerImage

Function LoadBannerImage
    LockWindow on
    ${NSD_CreateBitmap} 0u 0u 100u 434u ""
    Pop $EULABannerImage
    SetCtlColors $BannerImage 0 0xF5F5F5
    ${NSD_SetBitmap} $BannerImage ${TempBannerFilePath} $8
    LockWindow off
FunctionEnd