Friday, March 29, 2019

VPN client throughput limited by cpu resources?

For months we've been having issues with Palo alto global protect chasing slow download speeds on end users laptops. I myself experienced the same - 400mb download off VPN at home, 200mb download on VPN at home.

I had a new laptop yesterday - i7 8th Feb. Did a speedteest this morning and surprisingly my download speed off and on VPN was the same - 400mbps.

As a test I limited my cpu state to 50% and I was able to recreate what I saw on my old laptop - 200mb on VPN and 400mb off VPN. Downclocking further saw even more exaggerated results.

Is this a thing? Slow CPU causing slow client VPN performance? Kind of makes sense but I've never seen this behaviour before



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