Best Practices to improve Performance in JSP

Use jspInit() method to cache static data
Use StringBuffer rather than using + operator when you concatenate multiple strings
Use print() method rather than println() method
Use ServletOutputStream instead of JSPWriter to send binary data
Initialize the 'out' object (implicit object) with proper size in the page directive.
Flush the data partly
Minimize code in the synchronized block
Set the content length
Release resources in jspDestroy() method.
Give 'false' value to the session in the page directive to avoid session object creation.
Use include directive instead of include action when you want to include the child page content in the translation phase.
Avoid giving unnecessary scope in the 'useBean' action
Do not use custom tags if you do not have reusability.
Use application server caching facility
Use Mixed session mechanisms such as 'session' with hidden fieldss
Use 'session' and 'application' as cache.
Use caching tags provided by different organizations like openSymphony.com
Remove 'session' objects explicitly in your program whenever you finish the task
Reduce session time out value as much as possible
Use 'transient' variables to reduce serialization overhead if your session tracking mechanism uses serialization process.
Disable JSP auto reloading feature.
Use thread pool for your JSP engine and define the size of thread pool as per application requirement.

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