Do a google search for "google chrome"
If that runs slow you know its the PC, if it runs fine then you know its Internet explorer.
I no longer use internet explorer because it it so slow but i remember there was a setting which would scan web-pages for phishing threats.
Im not sure if its called that or if they have changed over to the smartscreen filter.
More info on smart screen filter here:
Microsoft smart screen
There are also some helpful tips here which could improve internet explorer perfomance:
Hints & Tips for internet explorer
I hope this helps
Regards
Mike
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