Game lagging+sound collapsing, help needed

[Kamil]

Hello everyone,
Recently I have started playing League of Legends with my friends and I have this problem. The thing is, everytime when there a more than 2 people talking, the game starts lagging and the sound is 'collapsing', I can not understand a single word my friends are saying. It is really annoying when it comes to THIS intense moments of game and there I am, unable to do anything, in the game, and unable to communicate with my teammates.
I have tried chainging the codec of the server from 32kHz to 16kHz but it didn't really help. Is there anybody with similar problem and know how to deal with it?
I'm waiting for any help and thank You all in advance.

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Best regards,
Kamil

[dante696]

Please give us more details about your hardware and cpu usage without someone talking and with someone else talking.

Is your sound driver up-to-date?
How fast is your internet connection speed?
What ping and packetloss do you have?
Does this also happen on other servers?

[Kamil]

Hardware:
- Intel Core 2 Duo, 2.33GHz
- 2 GB RAM
- NVIDIA GeForce 8600 GT
CPU usage without someone talking is around 20-30%, with somebody talking is like 30%+.
All the drivers are up-to-date.
My internet connection: 2 MB/s.
Ping around 15ms
Packetloss 0%
It is happening on every server, it's kind of better when I put 16kHz Codec but still the problem occures. I tried different programs, like mumble, but it was even worse.

[dante696]

So this not only Ts related :-/

Please try this to reduce the CPU usage:
disable our Echo reduction and Echo cancellation under Settings > Options > Capture

[Kamil]

I have a router and several computers are on the same inernet connection. I have noticed that even if someone is using teamspeak or skype on other computer, mine is lagging. Does it mean that it's strictly the internet connection problem?