if concern about magento performance, should run php in non-suExec mode and enable opcode cache. I checked the httpd_config.xml, it's configured to run php in suExec mode.
just read apache's mod_vhost_alias document, I think lsws not support it yet(I'll correct it later if this is wrong). not sure if lsws's "Virtual Host Templates" is close to your demand.
the native vhost format is .xml. you can refer the default vhost configuration file /usr/local/lsws/DEFAULT/conf/vhconf.xml and write your conversion script from ZWS -> litespeed. the server's configuration file is /usr/local/lsws/conf/httpd_config.xml
please refer http://www.litespeedtech.com/support/wiki/doku.php?id=litespeed_wiki:php:uploadprogress_bar
4.File Uploads Configuration Options
check if those limits are set correctly.
so please check:
lsws admin console -> Configuration -> Server -> HT Access -> Allow Override
and similar setting in your vhost -> general -> HT Access -> Allow Override
uncheck None, and check all others, then restart lsws
you can start from 2-CPU license.
likely php will be the bottle-neck, best to disable php suExec so opcode cache(APC, xcache) can work to boost php performance.
compare with apache, litespeed will use less memory and cpu load is lower.