Put those things under content advisor.
From: Blocking Unwanted Parasites with a Hosts File.In many cases using a well designed HOSTS file can speed the loading of web pages by not having to wait for these ads, annoying banners, hit counters, etc. to load. This also helps to protect your Privacy and Security by blocking sites that may track your viewing habits, also known as "click-thru tracking" or Data Miners. Simply using a HOSTS file is not a cure-all against all the dangers on the Internet, but it does provide another effective "Layer of Protection".
Read the rest here:Editors Note: in most cases a large HOSTS file (over 135 kb) tends to slow down the machine. This only occurs in W2000 and XP. Windows 98 and ME are not affected.
To resolve this issue (manually)