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I have a Dell Vostro 3500 laptop with Ubuntu 13.04 installed. Wheenever this laptop is on wifi network, it makes the connection on all other devices (mac, android, windows ) using same network very slow, so much that even a simple browser page does not load on other devices.

This happens everytime. I looked at the issue at : One Ubuntu laptop on wifi occasionally makes other laptop's connection slow but do not know if that is applicable in my case or what I should be doing as the configuration (OS as well as wl kernel ) is different from that case.

My information is as follows:

$ sudo lspci -nnk | grep -A8 -i network
12:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)
    Subsystem: Dell Inspiron M5010 / XPS 8300 [1028:0010]
    Kernel driver in use: wl
13:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168 PCI Express Gigabit Ethernet controller [10ec:8168] (rev 03)
    Subsystem: Dell Device [1028:0441]
    Kernel driver in use: r8169
ff:00.0 Host bridge [0600]: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers [8086:2c62] (rev 05)
    Subsystem: Intel Corporation Device [8086:8086]
ff:00.1 Host bridge [0600]: Intel Corporation Core Processor QuickPath Architecture System Address Decoder [8086:2d01] (rev 05)

Kindly let me know what is the best way to resolve this. If you could give me steps that would be great

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