10 Tips for Writing High-Performance Web Applications

Rob H gave some tips in his MSDN article on Writing High-Performance Web Applications

Overall 10 tips are:

Performance on the Data Tier
Tip 1—Return Multiple Resultsets
Tip 2—Paged Data Access
Tip 3—Connection Pooling
Tip 4—ASP.NET Cache API
Tip 5—Per-Request Caching
Tip 6—Background Processing
Tip 7—Page Output Caching and Proxy Servers
Tip 8—Run IIS 6.0 (If Only for Kernel Caching)
Tip 9—Use Gzip Compression
Tip 10—Server Control View State