Ramesh,
In my current client location there are about 60 projects in the Deployer and it takes about 40 secs to load them.
You might want to check the command line options for Deployer. I believe they allow you to do an export,delete or add Projects. You can create three scripts, one to export, one for deleting the existing projects and one for importing the projects. When you are applying a fix, run the first two scripts and apply the fix and then run the third script. Let me know if this worked!
Cheers,
Akshith
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