WHM -->Edit DNS Zone not automatically populating field with more than 2500 zones

Go to WHM--> Edit DNS Zone. If you start tying for a domain name in search box, it shows full domain instantly.

It's working fine for me before but I recently migrated about 6 thousand zones and then it's not working anymore.

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From Support ticket #6010127 Technical Analyst (Melanie Littleton) said,

I have replicated this concern on a test server simply by creating quite a few zones.

This issue appears simply that the code is timing out due to the number of zones. I have reviewed prior cases regarding this particular feature, and I have found in my research that this feature is auto-disabled based on the number of zones:

"The code turns off auto complete when there are > 2500 domains since it does not scale well enough."

You may wish to open a feature request for a autocompletion feature that scales well for servers with more zones.

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Now, I am here how to resolve this issue.