HDD Light constantly blinking, system freezes 10-15 seconds

Hi. My English is very bad and I will try to describe problem simply as much as possible.

When I'm browsing internet, sometimes my hdd light blinks madly, system freezes, screen shows to desktop about 10 or 15 seconds. Then the web page loads and everything continues normally. The strange thing is that it happens in specific web pages. For example when I first visit tomshardware guide in a boot it always happens. And it happens only one time a between boot and shutdown continuum. What I did to solve this issue:

1/I checked my S.M.A.R.T values. It's ok.

2/I scanned my hdd with HDTune and Hdd Regenarator. It seems pretty good. No bad sector

3/I scanned my computer for malicious programs. No virus found.

What is the reason of that and what I have to do?
 
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