cubicweb #121978 web performances [open]

According to Firebug, loading the login page of CW applications means loading 130Ko of data (mainly js files), and takes several seconds. An important effort should be done in getting this improved. The situation is emblematic on this login page on which there is almost nothing (but the login "box"), but it's a general weakness in CW IMHO.

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load left2.000
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