OK thanks for your help. Maybe I’ll give it a try sometime.
I tried out the use of onPostCull callback and onDrawCall callback and while that logic worked as expected you and yaustar were absolutely correct and I could not update the html/css loading UI during the frame being processed, and the UI only updated at the end of the frame.
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In the thread that I linked to, some developers use a frameless iframe on the loading screen to render stuff (gifs etc) while the parent page is thread locked.
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That indeed can be a solution (separate iframe just for the loader), it did work mostly OK for us in this older Aritelia build: Aritelia
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