I have the same issue:
~ ❯❯❯ lspci -nn -d 14e4:
02:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme BCM57765
Gigabit Ethernet PCIe [14e4:16b4] (rev 10)
02:00.1 SD Host controller [0805]: Broadcom Corporation BCM57765/57785 SDXC/MMC
Card Reader [14e4:16bc] (rev 10)
03:00.0 Network controller [0280]: Broadcom Corporation BCM4331 802.11a/b/g/n
[14e4:4331] (rev 02)
~ ❯❯❯ sudo dmidecode -s system-product-name
MacBookPro8,1
~ ❯❯❯ uname -a
Linux manolito 3.13.0-45-generic #74-Ubuntu SMP Tue Jan 13 19:36:28 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux
~ ❯❯❯ lspci -nnv
03:00.0 Network controller [0280]: Broadcom Corporation BCM4331 802.11a/b/g/n
[14e4:4331] (rev 02)
Subsystem: Apple Inc. AirPort Extreme [106b:00d6]
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at a0600000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: bcma-pci-bridge
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https://bugs.launchpad.net/bugs/1069766
Title:
14e4:4331 Slow transfer speeds with BCM 4331
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