We have been using the LightStreamer Vivace for updating our clients. Recently we have noticed strange delays in peak periods. Using the Monitor Console, this information is acquired: At the peak time we had 1650 online users, 3000 connections, 1700 sessions and 6000 total subscribers.
Currently we have 2 web pages, the first page contains a stock watch, watch-list and total market details. The second is a market list with 400 instruments. Each instrument is updated using three message types. MaxItemFrequency of the above three messages is 1 second. In the second page, the messages are updated every one second and MaxBandWidth is 250.
Are these delays normal?

Server specification:
OS: windows web server 2008 r2
System type: 64-bit Operating System
DL380G7 HP Server
2*CPU Quad-Core Intel Xeon Processors X5670
(2.80GHz,8MB L3 Cache,95W)
32GB PC3-10600 RAM
6*146GB/15K DP SAS 6G HDD
Smart Array P410i/512MB+BBWC Controller
2*750W Hot Plug Power Supply