Browsing is very slow on Mac Mini connected to 100mbit LAN. FTP and file download is very fast.

Hi all
I have a strange behaviour of my Mac MIni 2012. The mini is connected to the internet by LAN. When I download a file via http or ftp everything is very fast (arround 95mbit/s). But when I try to open a website in Safari, Chrome or Firefox i have to wait some seconds until the page starts rendering.after the page is rendered completely, everything works fast and smooth.
Do you have any ideas where the problem migth be? I have reinstalled Mavericks from zero yesterday. The problem resists. With my Macbook Air (conntected to the same router) and my Windows computer I dont have this problem.
THanks in advance for your help.
Greets
Marc

By any chance, do you run sophos? I had the same issue as you and fixed it on my mac mini and macbook pro by doing the following:
Sophos --> Open Preferences --> Web Protection --> General
You will need to enter your admin password after clicking the padlock in the bottom left to allow you to change settings.
From there, deactivate "Block access to malicious websites using realtime URL reputation checks". For good measure, I also deactivated "Block malicious downloads from websites".
Hope this helps!

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