I have lsws 2 cores installed. mySQL is optimized too. But when I have high traffic (from real-time starts of lsws, I have nearly 600 requests in processing and 40 requests/sec), the server is very slow.
Server load is not very high, just around 2. Server has 4GB RAM and it's quad core CPU with raid10 SATA disks array
Is there anywhere I can find out the bottleneck? The server is not weak at all, and the number of connections, well, I think it's not too many either.