asp内存和速度优化，第一部分（英文版）

Memory and Speed Optimization with ASP - Part I
It is an all to familiar problem: optimizing the memory and speed of your web sites. Maybe you have been, more than once a week, in the situation where your web server stopped giving you any ASP page, while the HTML pages were correctly displayed. One of the challenges faced by the web developers is how to create a fast (usually a faster that the one you have) application out of a series of HTML and ASP pages.
When programming ASP pages, memory and speed optimization can be acquired in two different ways. Because HTML pages are not processed at the server-side, we will talk more about memory and speed optimization of ASP pages:
By programming good ASP pages. This article is all about optimizing by writing good ASP pages.
By configuring the web server. We will cover this topic in another article.
When talking about optimizing ASP pages, we should start from the deepest level: basic variables.
One of the biggest differences between Visual Basic (VB) and ASP programming is the variable declaration. VB is a programming language, so you can define variables of a specific type:
Dim I as Integer        ' Integer Declaration
Dim a$        ' String declaration
Dim objMyCom as Object     ' Object Declaration
Dim var as Variant    ' Variant declaration
While ASP is a scripting language, where the only available type is VARIANT type. All the variables declared in ASP are of type VARIANT . Unfortunately, this makes all the operations slower, because the work with VARIANT is slower. The system has to first evaluate the type of the variant, convert it to the most appropriate of the operation that is to be done, and then make the operation.
VARIANT is a very smart type of variable. It has great capabilities of storing EMPTY and NULL values, along with any types of data, such as (integers, doubles, strings, currency and dates, arrays or objects).