background with parallax effect on mobile - shaking glitch

hello 

I've got a problem on mobile with a section that has an image (jpg) set up as parallax - it's glitching (shaking) on fast scrolling - why? Is the image not big enough?

The problem is not visible (even with fast movements) while scrolling BUT the finger needs to touch the screen. On iMac-browser with a mobile view is perfect as well. Please adivce what should I change? 

kind regards, pozdrawiam :) 
Lukasz 

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