You can use the hidpi option to turn off WMS request based on pixelRatio. 
The result is mainly visible on texts.
See http://jsfiddle.net/Viglino/Lpbnw14z/

Also pay attention to the fact the canvas map already gets into account the 
pixelRatio, ie. a 100x100 px map  will result in a 200x200px canvas on 
mobile (with pixelRatio of 2).
In your fiddle, your map canvas has a 950x1400 px canvas on a laptop, but 
1900x2800 px on a mobile: 4 times more area and 4 time longer to draw...


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