Download speeds may be very slow, even with good client settings.Workarounds: run as administrator and/or set Windows XP SP3 compatibility mode for the executable. Workarounds: use File -> Exit to close the program and/or toggle bt.graceful_shutdown in the Advanced settings. The uSerenity process may remain active or crash after exiting.Large torrent piece sizes (> 16 MB) are not supported.This is a limitation of the base client and has no fix. uSerenity 2.2.1 Build 25302 > BitTorrent Inc.