I just notice that my performance issue show up when I trying use a time span of 24 hours... when I reduce the time to 1 hours or I do any other time span the performance is normal... I believe I need double check my SQL Server.
The following database maintenance tasks are essential for improving database performance and GUI response times:
1. Rebuild indexes on SV_TimeSeriesData table
2. Rebuild statistics on entire database
Hope it helps.