@HenriqueGurgel I think the slowdown issue is inherent in Palo Alto Networks GlobalProtect. I have used PAN GP for about 6 years now, across two different models (PA-500 and now PA-820) and the situation with the degraded download speed has always been the same. The firewall software and GP client version do not seem to matter. I've seen this same issue on PAN 6, 7, 8, and now 9 versions, and GP client 2, 3, 4, and now 5. We have a 1GB fiber line to the PA-820. We have people working remotely from customer offices, on all types of different connections (wired, wireless, 200mbps, 500mbps, 1gbps, it doesn't matter). Download tests will always report slow speeds (2-4mbps). However, as was mentioned by another reply, when you look at the performance in aggregate, meaning across all remote users, the performance isn't as slow as 2-4mbps. I think part of the issue is the speedtests; I don't think they play well with IPsec VPN in general. However, I agree that other vendors' firewall VPNs (Cisco, SonicWall, etc.) do not seem to suffer from the same slowdowns. But remember also that you might have the threat stack enabled so the traffic has additional processing done on it. I realize Palo Alto Networks says that shouldn't slow down traffic below a certain amount, but here we are, all posting about slow PAN GP speeds. Over the years, I've never bothered to open a support case to get the official answer, as the speed was always "good enough" to support our workloads. However, I would like to understand why this happens.
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