Downloading apps on Mac OS X 10.8.4 with Creative Cloud App Causes Destructive Feedback on Firewall

Question

Okay, here's the network profile, workstation profile, and symptoms of the problem.
Site Profile
Network
Asymmetrical 22 Mbit inbound / 2 Mbit outbound DSL terminated by a RFC 1483 Bridge into a pfSense 2.0.3-RELEASE (amd64) Firewall
Hardware profile of firewall: INTEL CPU: Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz (3292.54-MHz K8-class CPU)
INTEL Motherboard: INTEL DH61CR
Motherboard Native Network Adapter: <Intel(R) PRO/1000 Network Connection 7.3.2> to LAN Network at MTU 1200 (MTU accommodates IPSEC tunnel overhead)
PCIe Network Adapter: <RealTek 8169/8169S/8169SB(L)/8110S/8110SB(L) Gigabit Ethernet> to WAN Network at MTU 1500
Workstation
MacBook Pro 17", Mac OS X 10.8.4
Connected to network by CAT6e Ethernet cable to 8-port 16Gbit-fabric Gigabit Switch
Internal 512GB SSD with Trim Enabled
SYMPTOM
Under normal conditions, with network under diagnostic constraint, inbound traffic on WAN is within 10% tolerance with outbound tranffic on LAN
In effect, under every circumstance if the inbound traffic on WAN is 1 Mbit, then the outbound traffic on LAN is 0.9 to 1.1 Mbit
When software is selected to be installed in the Creative Cloud Application [Version 2.0.0.183 (2.0.0.183)] the inbound traffic on the WAN instantly shoots to 22Mbit, while the outbound traffic on LAN remains at 1Mbit. This behaviour can be repeatedly demonstrated by stopping and starting the download and installation of software in the Creative Cloud Applicaiton.
Removal of all proxy and IPSEC functionality on the pfSense Firewall does not change this behaviour.
As well, it took two days with a completely crippled network to get Photoshop CC installed at a few percent per hour.
While the CC App is downloading, pages fail to load and IMAP connections are dropped. Once again completely diagnostically isolated to only while the CC App is downloading.
It took over a week to figure out what was killing our network, I have extensively diagnosed this problem and can say with certainty that CC App is the culprit.
Can anyone see any reason why this network configuration should be so problematic for downloading and installing CC applications?

Answer 1

Although that document doesn't specifically apply to network protocols, it turns out that it was enough to trip over a mistake in my original testing of the Adobe CC downloading and installing problem.
In my initial post I state that I tested the issue without Proxy on the firewall, however, I tested it again this morning, and removing the Proxy fixed the problem. I can't see a way to go back up and edit my original post so I'm putting this here in red to make it clear.
ADOBE Creative Cloud (downloading and installing) is NOT COMPATIBLE with Squid Proxy 3.1.20 pkg 2.0.6 on pfSense 2.0.3 (amd64).
Currently I have removed the package from the firewall. I will later review the guide and see if we can install and configure it in a fashion that doesn't conflict.
Thank you,
Kirk