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Adding border to canvas drops FPS on mobile devices


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The weirdest bug/issue just came up, I had a very light game (in terms of updates/actions, etc) and I was getting no more than 25 FPS on mobile devices (quad core tablet, dual core mobile phone android)


When I was trying to figure out what was wrong I deleted one line from my .css file and suddenly the game runs with 55-60 FPS as intended.


I reversed the changed line and again fps dropped to 25-27.


I simply had 

canvas { border: 5px solid white;}

Does anyone know why this happens? And moreover if any more css properties affect game performance.


Thanks guys, I hope we can clarify and find the reason behind this.



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