Thanks for taking the time to think through this and provide such detailed responses - I certainly appreciate it.
1) Differences in matching security policies.
2) Decryption Policies:
3) Different agent settings getting applied based on source location, and therefore the client behaves differently?
SR: Single portal/gateway so all clients get the same agent settings
I've logged a TAC case and will see what they say. Suspect I could be in for the long haul with this one...
For others benefit it looks like this may be related to a network adapter driver "feature" called NS Offload.
We'd originally eliminated this as it occurred on both wired and wireless connections, but through trial and error I've found that disabling this feature seems to have an immediate impact and resolves the performance issues.
It seems this feature is on both the wireless and wired NIC. Tried latest/different drivers but issue persists.
There is not much documentation on it: https://www.intel.com/content/www/us/en/support/articles/000005585/network-and-i-o/wireless-networki...
My assumption is it is causing the issue when traffic is "offloaded" from the tunnel adapter to the real physical adapter.
The 4G adapter does not have this feature which is why it was a non-issue when connecting the VPN over 4G.
- I had upgraded my file share server from Windows 2008 R2 to Windows 2016, but accessing file shares is still slow over Global Protect VPN
- Finally, I upgraded the PAN to 8.1.8-h5 and it seemed to have resovled this issue. Accessing the file shares over GP is now working much faster than before.
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