By Richard Kiessig, Rick Kiessig
Read or Download Ultra-Fast ASP.NET: Building Ultra-Fast and Ultra-Scalable Websites Using ASP.NET and SQL Server PDF
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Additional resources for Ultra-Fast ASP.NET: Building Ultra-Fast and Ultra-Scalable Websites Using ASP.NET and SQL Server
Gif" height="16" width="16" /> Here’s the resulting timeline: The HTML takes about the same amount of time to load, as does the first image. However, now IE requests all of the other images at the same time. Notice that there is significant overhead in opening the connections. 92 seconds vs. 00 seconds). IE behaves very differently when it uses a visible proxy. For example, loading this same page when Fiddler is active results in the following timeline: 20 CHAPTER 2 ■ CLIENT PERFORMANCE IE loads the images two at a time, just like when they all came from the same domain.
In those cases, you should in general prefer PNG or GIF to BMP. PNG files tend to be smaller, and the format supports alpha channels for variable transparency (blending) as well as gamma correction and progressive display (interlacing), which the other lossless formats do not support. For larger PNG files, encoding them with progressive display is desirable, in keeping with our principle for focusing on perceived performance. A page doesn’t feel as slow when the browser progressively renders large images.
See Chapter 10. • Understand how SQL Server manages memory. For example, when a T-SQL command modifies a database, the server does a synchronous (and sequential) write to the database log. Only after the write has finished will the server return to the requestor. The modified data pages are still in memory. They will stay there until SQL Server needs the memory for other requests; they will be written to the data file by the background lazy writer thread. This means that SQL Server can process subsequent read requests for the same data quickly from cache.