You can use the hidpi option to turn off WMS request based on pixelRatio.
The result is mainly visible on texts.
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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