KDE tool for check network activity

[linuxfluesterer]

Hallo...
I'm using SL X with KDE 4.9.2 on an Intel Core i5 with 6GByte Ram and 500GB Sata notebook. I am content, really.
But now something happens, what I remember from SL 8.
There have been long time sequences, while my hdd drive was working (I don't konw, reading or writing).
These sequences lead some minutes, 5 and more. In this time, I have a very delayed reaction with my mouse to change an application or scrolling down...
In GKrellM I saw in that moment, that my hard disk was used with 4 MByte per second and also my network activity was high. But I did NOT download anything.
Is there any tool (cli also) which I can use to tell me, which website (I use Chromium) uses netactivy (download/upload) and/or which application uses my hard disk?
The session manager (ctrl+esc) does not help me really.
In such this moment my hdd drive is very busy again. I have 6 GByte RAM with 3GByte used and 3GByte free.
Swap is not used.

Thank you,

-Linuxfluesterer (I love KDE ...)

[Fitzcarraldo]

If you have mlocate installed then it created a cronjob to run the indexer once or twice a day. While it is indexing the HDD it can appear busy. If you have Nepomuk semantic search enabled then it also indexes the HDD periodically and the HDD can appear busy.

I use the KDE Network Monitor plasmoid to view network activity on my wired and wireless network connections. It comes with the SL KDE installation.