My develop PC is i7 2600/8G RAM/Win7 64bit/IIS7/SQLSERVER2008R2/VS2010 SP1.
I use nop 1.90.
I rebuild it in Release mode, and set compilation debug to "false".
There're more than 1,800 products in my store, and pictures are stored in DB.The mdf size is about 340M.
It takes minutes on first homepage load, and about one minute on changing categories.

How can I solve this problem?
Should I move to 2.3?
Thank you.