uses 25-50% of cpu so it freeze hangs, only way to get back some control is to ctrl alt del on client (wich hold captive the mouse & keyboard focus, sometinmes I need to close session 'cos I can't keep mous control from ctrl-alt-del menu to desktop.
I use 100% of the time: chrome+kompozer+firefox+virtualdj
and even virtualdj is set to asio to not conflict it freeze & by moments 1-3 mins tried reinstall, format cache & reistann 32bit instead of 64bits, tried to protect all files of synergy as soon as they're on disk(prgfiles(86))