[MovedGoalPosts]

The speed that your internet connection is able to go at cannot be affected by the security software on your computer. The internet will serve up the data as fast as the line bandwidth permits, the sending computer or server can issue it, and your own PC can accept it.

Inevitably any security software will affect the speed at which data becomes available to you on your machine. The security software, depending on it's settings, will need to scan the data being received, a process which must take a moment in time. Some programmes will scan on the fly as the stuff is coming in packet by packet, other stuff will get scanned once the file is more complete.

If your PC is ready for a data packet to be received it will accept it. But if your PC is busy dealing with the last bit because some secirity software is busy checscanning the last file, it might reject the next bit, so appearing to slow up your connection.