Why is the RH-SSO admin UI very slow when using about 300 realms?

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Issue

When using about 300 realms UI is very very slow, and it takes more seconds to view all realms.
RH-SSO 7.1.0 fails to start when using a high number of realms (about 300+ realms).
How many realms are supported in a given RH-SSO deployment ?
The migration from RH-SSO 7.3 to RH-SSO 7.4 takes quite some time depending on the number of realms in the installation:
- 120 realms: 17min
- 60 realms: 5min
- 30 realms: 1min 40sek

Environment

Red Hat Single Sign-On ( RH-SSO) 7.x

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