If you don't want IE8 to run with many iexplore.exe processes...

Artigo
06/16/2010

Opening a New Tab may launch a New Process with Internet Explorer 8.0

https://blogs.msdn.com/b/askie/archive/2009/03/09/opening-a-new-tab-may-launch-a-new-process-with-internet-explorer-8-0.aspx