Ticket entry extremly slow with database growth

For demo website and our test machine with few records ticket entry has no issues[as fast as your demo website].
As our ticket table from live database is only containing 52000 rows still user ticket creation and updation [status change of tickets] has become very slow.
There are wait events also recorded in logs.
We are using PostgreSQL 13.1 764 bit currently.
Request you to please review ticket specific application code to override this issue.

Server configuration is 16gb ram with 4 CPU having 8 cores.
Just to brief the issue ,earlier we were using mysql with lampp and having same slowness issue.
After switch to Postgressql13 with latest Projeqtor version 8.6.5 in centos 8 with apache & php the issue still persist.
No other performance issue apart from Ticket slow insert and slow status change.
Will try to drill down the issue and possibly post the solution in tips and tricks section .