Hi Raj,
please see the links below.
What is the hardware configuration of your server? How much memory have you allocated?
Is the Author instance local to the users or cloud based? If in the cloud where are your users and in what region is the server located?
Have you checked the network latency?
Have you taken heap dumps? Run a profiler against your instance? Checked the slow queries in the JMX console?
In the AEM6 touch developer mode have you checked the page load times to see which components are taken the longest to load?
When you open a page, how much data are you downloading with each request?
Regards,
Opkar
[1] https://helpx.adobe.com/experience-manager/kb/AnalyzeSlowAndBlockedProcesses.html
[2] https://helpx.adobe.com/experience-manager/kb/performance-tuning-tips.html