I will update my reasons on the "Idea" post, but I think continuing the discussion here has merit. Or would you rather migrate the entire thread there?
I have also used Cisco VPN portal clients, such as QuickVPN, or various "generic" Cisco VPN software packages. I have also installed and used the VPN offered by The Green Bow - a French firm - as I have had clients in the past that needed me to use/test that client.
Re: Performance hits
I want to make sure we're using the same terminology:
Performance hit: A situation where the computer's performance is degraded beyond what would normally be expected, sometimes significantly.
Stability issue: (May also be accompanied by a "Performance hit") A situation where the continued safe and stable operation of the software, or even the operating system itself, is significantly impaired.
Any time you have more than one encapsulating protocol running at a time, you're going to get a "performance hit". (i.e. Running Giganews using multiple SSL connections through VyprVPN can cost up to 20% of your "open line" network speed.)
I strongly suspect that running an encrypted connection through another encrypted connection is the cause of it, and it seems to be more pronounced on slower-speed connections (ADSL) as opposed to faster connections (DOCSIS-3 over Cable TV).
I have experienced situations where running QuickVPN (Or other clients like The Green Bow), with the VyprVPN service running in the background has caused:
Significantly degraded performance, as in "orders of magnitude".
- Unstable connections, where the established VPN would randomly die.
- System crashes. Some were "hard" crashes that stopped Windows 7 at a BSOD, others were "soft" crashes where Windows rebooted and displayed the "Oh S&^*t!! We just had a major failure, dude!" dialog on restart.
These were experienced on older versions of VyprVPN, and what may have been "cruftier" installs of Win 7. ("Cruftier" being defined as "After I have beaten the stuffings out of it for a year or so, installing, uninstalling, re-installing, re-un-installing stuff that I test for a living.")
The systems may have used older versions, or cruftier installs, but it only takes one or two major system crashes to scare me away forever!
Because of these experiences, my general skittishness about running more than one at a time, (and my implicit faith of the engineering genius at Microsoft! ), I generally like to have only ONE VPN process running at a time.