after upgrade community v4.0.1 to v5.0, then Web management very slow working, some pages continuously loading.

Steps :- 

1. create a instance by using centos, deb-9, or deb-10 operating system flavour.
2. install community 4.0.1 server.
3. after install successfully, generate some test data and checked GUI web page load time.
4. now upgrade the community 4.0.1 server to v5.0 version.
5. when upgrade successfully now login as admin, reseller or customer. and checked web page load time.

Actual result :- after upgrade community v4.0.1 to v5.0, then Web management very slow working some pages continuously loading. 

Expected result :- It should be working fine with less load time.

For Refernece as per client concern:-  https://forum.astppbilling.org/t/web-management-very-slow-after-upgrade-4-0-1-to-5/1064