High CPU 90% on webserver with dispatcher setup

[#1]

We are facing high CPU : More than 90% for higher concurrency load test on all 3 webserver instances . All these webservers pointing to same Publisher instance.

Can Dispatcher cause high CPU ? Any tuning configurations?

[#2]

That's an odd topology. Typically you would map a single Dispatcher to a single AEM Publish 1:1.

Unusual to point 3 Dispatcher's at a single Publish...

[#3]

Adding to Marc's point, you might need to optimize caching. Check [1] for more details.

[1] Optimizing the Dispatcher cache

Optimizing AEM Site Caches

[#4]

High CPU usage can have many root causes. First of all, does the webserver/dispatcher cause this high CPU usage or is another process causing it?

What operating system is this? What hardware? What disks are used to store the dispatcher cache?