Firstly, please upgrade your Evaer to the most recent version(1.6.5.82) to have the issue fixed.
Upgrade link is http://www.evaer.com/upgrade.htm
If the issue still exist, please temporarily turn off your Anti-virus software, the Anti-virus may get a false positive detection on latest Evaer. Then restart Skype and Evaer to have a test.
Tags: not fluid, very chunky