Client Audio Issues Workaround (http://community.eveonline.com/news/news-channels/eve-online-news/client-audio-issues-workaround/)
26 February 2015, 11:15 am
We have been made aware of an issue that may potentially cause performance issues for players in large fleet fights, or during high activity missions on low end gaming systems.
Unfortunately, the only workaround at present is to either disable audio, or to disable turret graphic effects in the escape menu within the EVE client, as these graphics trigger the affected audio.
We are currently working on a solution to this issue, and should have it patched as soon as possible.
Source: EVE Online News