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I suggest you to take a look at the following links, that show some recommendations in regards the wifi performance:
How do I improve my 802.11n wireless performance?
Why am I not able to connect at 300Mbps with my 802.11n device?
You can try also to update the firmware of your router and see if that help and the latest drivers at the intel wifi adapters as well.
I hope this recommendations help you.
Thanks for the answer.
I checked the settings and with the same settings 13.04 driver version gets 300 Mbps, while 14.03 can't reach over 130 Mbps. I have:
802.11n Channel Width (band 2.4/band 5.8) - auto (not limited to 20 MHz)
802.11n Mode - default (on)
Ad Hoc QoS Mode - default (WMM on)
Fat Channel Intolerant - default (off)
Mixed Mode Protection - default (CTS on)
other settings (mobility agressivness, adhoc channel, power management) are default but they don't seem to have any meaning for transmission rate.
But after I updated firmware in the router it seems I can get 300 Mbps with new driver. So thanks again, my problem seems solved.