identification of components must be included in performance testing:

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1. Functional, business critical features
Components that have a Customer Service Level Agreement or those having complex business logic (and are critical for the business’s success) should be included.
Example:  Checkout and Payment for an E-commerce site like eBay.
#2. Components that process high volumes of data
Components, especially background jobs are to be included for sure. Example: Upload and download feature on a file sharing website.
#3. Components which are commonly used
A component that is frequently used by end-users, jobs scheduled multiple times in a day, etc.
Example: Login and Logout.
#4. Components interfacing with one or more application systems
In a system involving multiple applications that interact with one another, all the interface components must be deemed as critical for performance test.
Example: E-commerce sites interface with online banking sites for payments, which is an external third party application. This should be definitely the part of Perf testing.

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