[GiedriusQ]

Originally Posted by webizen

Your throughput is not necessarily slow given your 1Gbps network. It depends on what kind of file (smaller files lower the bandwidth usage due to TCP overhead) you serve and where the bottleneck is.

From the 'top -c' screenshot, looks like I/O is not the bottleneck. server load is not high. Real-time stats show you only have less than http 1000 connections used. However, your lsphp5 has max connection of 1000 which is too high. It should be set to 100~150 (in your case). so is the PHP_LSAPI_CHILDREN variable.

I did what You say, but nothing changed.
For example by internet max speed is 500KB/s. When I'm download file from server I get only ~100-200KB/s, but when using nginx and download same file I get all my 500KB/s all the time.
I think something really wrong with my litespeed server settings, but I can't find out what...