[CentOS] update on: Centos email server suddenly much slower. What to do?

On Friday, September 07, 2012 05:09:09 AM M. Fioretti wrote:
> I do have the feeling, after the exchange we had yesterday, that the DNS
> servers my VPS provider told me to use had some problem now fixed, but
> nothing more. Of course, the idea that I don't know for sure what happened
> and it may happen again doesn't make me happy, but I honestly wouldn't
> know what/where to investigate at this point. Further comments are
> welcome.

Did you say 'VPS'?

It may be that other VPS instances on the host could impact your VPS performance, and there may be nothing you can do about it.