Extremy slow internet speed

Question

Hi 
 I have a new Sophos XG115 without any firewall rule besides the default one, with a basic license, default webfilters and no IPS activated. It is connected to a router and to a internal switch. Both interfaces have 1000 Mbps - Full Duplex Auto-negotiated. When I make a speed test I'm at around 30 Mbps Up and Down. But when I try to open a website, it takes 15 seconds or more. Before we set up the firewall it was much faster. Also over the old WLAN, who is not behind the firewall it is much faster as well. 
 Any idea what could cause that?

JDiz · Accepted Answer

I had the same issue where the download speed slows down when using the XG 105 firewall. 
 How I fixed the slow issue was to update the Firewall Rule used by LAN users. 
 
 Firewall -> Edit User/Network Rule -> Advanced, Intrusion Prevention -> set to None

Nino Padrutt · Answer

Hi, I booted to the firmwarew SFOS 16.05.3 MR-3 which came preinstalled and here the performance is fine. So it seems there is a bug or something in the new version.

Aditya Patel · Answer

Hi Nino , 
 It would seem that the issue with the negotiation which would lead to packet loss and would enable to retransmit the packets again. Since you are using 30mbps up/down stream I would recommend you to set to 100mbps Full duplex manually and check if that would improve the performance. 
 Another hint may be observed on the interface if there is an error or not. 
 
 Toggle 'u' two times to get this page and check if its 0 or not as per the screen shot.

LuCar Toni · Answer

As far as i know, Support found the reason and is already working on a Patch. Would expect it for next MR Release. 
 FloSupport can you track this?

Will Mott · Answer

I was having the same issue. I disabled "Advanced Threat Protection", and now all is good. 
 
 Will