The internet download speed as measured by (speedtest.net) is ~15 Mbps
when I try to connect from my desktop. From a different machine (my
laptop), I get around ~30-40 Mbps. Could you please tell me how to fix
this?

Network connection:
{desktop or laptop) connected wireless to -> linksys wrt54g router ->
ISP (optimum)

On the desktop, I am using "Panda Ultra 150Mbps Wireless N USB
Adapter" <https://www.amazon.com/gp/product/B00762YNMG/> to connect to
the router.

The laptop has a builtin wifi adapter, Intel(R) Dual Band Wireless-AC 8265.

The desktop is running Debian stretch. The laptop is running Windows 10 Home.

Network adapter information on the desktop using lshw:
% sudo lshw -C network
  *-network DISABLED
       description: Ethernet interface
       product: NetXtreme BCM5722 Gigabit Ethernet PCI Express
       vendor: Broadcom Limited
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: 00
       serial: 00:10:18:ea:76:12
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list
ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 100
0bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3
driverversion=3.137 firmware=5722-v3.09 latency=0
 link=no multicast=yes port=twisted pair
       resources: irq:26 memory:f3ef0000-f3efffff
  *-network DISABLED
       description: Ethernet interface
       product: NetXtreme BCM5761 Gigabit Ethernet PCIe
       vendor: Broadcom Limited
       physical id: 0
       bus info: pci@0000:05:00.0
       logical name: eth1
       version: 10
       serial: d4:ae:52:c2:bc:e3
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list
ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 100
0bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3
driverversion=3.137 firmware=5761-v3.68 latency=0
 link=no multicast=yes port=twisted pair
       resources: irq:17 memory:f3de0000-f3deffff
memory:f3df0000-f3dfffff
  *-network
       description: Wireless interface
       physical id: 1
       bus info: usb@7:3
       logical name: wlan0
       serial: 7c:dd:90:8b:a1:14
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=rt2800usb
driverversion=4.9.0-9-amd64 firmware=0.36 ip=192.168.0.12 link
=yes multicast=yes wireless=IEEE 802.11

-- 
Kamaraju S Kusumanchi | http://raju.shoutwiki.com/wiki/Blog

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