Lag and Ideapad Z410 win 8 audio stuttering

I used this laptop for almost 2 weeks. Everything is going very well, but 3 questions that quite significant

The first problem is the audio latency

At first, it went well... But, a week, I noticed that the audio became stuttering and even in some cases, that it sounded like a robot voice. I tried to plug the adapter to see if the power management makes audio stuttering, but it does not solve the prob. Then I reinstalled the audio driver, it solved the problem for a few days but stuttering returned.

The second problem is the lag

I noticed that the laptop performance degrade while running in battery operation, even if I changed the power mode performance plan and programs forced to use the Nvidia card only. But the performance never be as good as when the computer laptop adapter is plugged.

Any solution?

Core i5 4th generation

64-bit Windows 8

4 GB OF DDR3 MEMORY

Intel HD 4600 and Nvidia GT740m 64-bit 2 GB of GDDR5 memory

OK guys, I found the prob
It looks like the tcpip.sys of the spikes upward latency
I managed to reset the ipconfig and winsock thingys and stuttering then gone forever (I hope)

Thanks for your help, everyone
and I thank you for this laptop Lenovo big

Tags: Lenovo Notebooks

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