Thanks for your answer.
OK.
"Connection" was improper, I meant : navigator speed (in this case, Firefox).
Well in fact maybe it's an idea but it seemed to me that displaying the web pages was a bit slower when Spybot (without Tea Timer) was present in the machine.
Then I looked at the tasks (in tasks manager) and I saw there was a Spybot task. I supposed that this task was a filter for malwares that, added to Kaspersky and Windows Defender, slowered the navigator.
Was does this task do exactly ? Is it a filter as I supposed it ?
Thanks