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[Martin Konopka <1289712@xxxxxxxxxxxxxxxxxx>]

So I added the tag (bug also in mainline). My testing concerned the default hotspot settings which are  obtained using the Control Centre (not the NetworkManager popup menu). It is the "WEP 40/128-bit Key" network.
I tested two variants:

1.) latest upstream kernel (3.14.0-031400rc6) on the hotspot-generating
machine AND default kernel (3.13.0-16) on the connected machine.

2.) latest upstream kernels on both machines

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https://bugs.launchpad.net/bugs/1289712

Title:
  extremly slow wireless connection between two notebooks

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I am trying to transfer data between two notebooks connected using
  their Wi-Fi radios.

  Machine 1:  HP ZBook 15 configured to serve as a Wi-Fi hotspot.
  Network controller: Intel Corporation Centrino Advanced-N 6235 (rev
  24). The machine also has a mobile broadband USB device (Huawei E3251)
  which connects it to the internet.

  Machine 2: Fujitsu-Siemens AMILO Pro V3205. It is connected to machine
  1 using wireless adapter. Network controller: Intel Corporation
  PRO/Wireless 3945ABG [Golan] Network Connection (rev 02).

  Both machines run latest development version of ubuntu 14.04. (Machine
  1 a 64-bit system, machine 2 a 32-bit system.) The Wi-Fi hotspot
  (running on machine 1) employs the WEP authentication. The connection
  speed is only about  0.1 MiB/s, i.e. about 0.8 Mbps. This is far below
  what the Wi-Fi adapters in both machines are able to do. The
  particular program I used was rsync. The data were transferred from
  machine 2 to machine 1. The speed was the same slow for rsync invoked
  either on machine 1 or 2.

  Yesterday I tried a different way to connect the two laptops: I
  created a Wi-Fi hotspot using an android smartphone with a WPA2 PSK
  autentication. That other wireless connection between the two laptops
  was at least one order of magnitude faster. (I do not remember precise
  number but surely it was much much faster.)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-16-generic 3.13.0-16.36
  ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
  Uname: Linux 3.13.0-16-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  konopka    1643 F.... pulseaudio
   /dev/snd/controlC0:  konopka    1643 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Mar  8 08:01:34 2014
  HibernationDevice: RESUME=UUID=bed0cd64-3da5-43a7-b4a7-6cc72965a402
  InstallationDate: Installed on 2014-01-31 (35 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140130)
  MachineType: Hewlett-Packard HP ZBook 15
  ProcFB:
   0 inteldrmfb
   1 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-16-generic root=UUID=56c3d081-90f2-445f-ade1-574586237cd6 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-16-generic N/A
   linux-backports-modules-3.13.0-16-generic  N/A
   linux-firmware                             1.126
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L70 Ver. 01.06
  dmi.board.name: 1909
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 94.47
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL70Ver.01.06:bd10/25/2013:svnHewlett-Packard:pnHPZBook15:pvrA3009DD10303:rvnHewlett-Packard:rn1909:rvrKBCVersion94.47:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ZBook 15
  dmi.product.version: A3009DD10303
  dmi.sys.vendor: Hewlett-Packard

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