Qt Quick High cpu usage on Ubuntu than Window

Hi guys,

Customer use Repeator to create 5000 items to show different color , meanwhile items will refresh different color in every 25 ms.
When ran it on Ubuntu the cpu usage is over 100% , you check the snapshot called ubuntu usage.png.
When ran it on Windows the cpu usage seemed normal , the snapshot called windows usage.png

they use Integrated video card named intel HD 630.
I think intel graphic driver is not good on ubuntu maybe but I don't have enough technology to update it.

I attached their test demo. Could you give me some addvices?