Wireless Speed Half As Slow As Wired

Hi there,

I got Dell Inspiron N5010, Win 8.1 pro 32bit,

bios AMI EFI v.15, CPU Type Mobile DualCore Intel Core i3-350M, 2266 MHz

RAM 3Gb

HD 5470

Dell DW1501 Wireless-N WLAN Half-Mini Card Network Adapter PCI

Router - 1 meter away

I have a problem with my WI-Fi connection it turns out to be twice as slow as the wired. My wired speed is 40 Mbts/s (which is about 5.5 Mb/s download speed), but the wireless gives me only 27 Mbts/s at the most. I got the right driver I think  -  

PCI\VEN_14E4&DEV_4727&SUBSYS_00101028&REV_01 

I've tried all the driver settings - the settings that somehow effect the speed are BSS Mode - its best with 802.11g,

then - WMM - disabled

and

XPress TM Technology - enabled.

With these settings I get around 27 Mbpts.

Then, my router is Huawei WS319 - it doesn't matter if WPS enabled or disabled, doesnt matter what kind of encryption I use WPA or WPA2 - no difference.

Doesn't matter Transmission mode, channel, Enable WMM (QoS), mcs, bandwidth - all that doesn't matter.

Router firewall disabled.

IGMP snooping enabled.

I tried a lot of other drivers - some of them were worse, some were the same.  

There were a couple of times when with this current driver I'd get 37 - 39 Mbts/s, though. But that was only a couple of times. The stable speed I get is a little over 25.

 I'm just wondering if its my laptop's wi-fi adapter....

Can anybody give any advice, please?