Little update, my site is now under heavy load and it looks like apache works better than lite speed.
Lite speed did 40-50 transactions per sec and max load was 45, and apache 2.2.11 does 120 transactions per second and load goes up to 110. But with apache site is more responsive than with lite speed.
114 requests currently being processed, 45 idle workers
193 requests currently being processed, 0 idle workers
DDos protection build in lite speed didn't helped much, i have set 1 transaction per second for dynamic and 10 for static, and load was still high and site was more or less unresponsive.