Webinterface not working properly after migration from 20.1 to 21.7

[dm]

Hello,

we had opnsense 20.1 running without problems for about over a year, and now I made a fresh install of 21.7 on the same hardware (seccond device with same components) and importet the configuration from 20.1. When I connect to the webinterface it takes about a minute to accept my credentials. I determined, that it takes about a minute to open the Dashboard. Even when I switch from other areas back to it. It also takes about 20 sec. to open any of the the areas unter Firewall -> Rules, over one minute to open Status Overview for IPSec. The rest is fast as before. On 20.1 anything worked without problems. Are there known issues for this migration path or has anyone a idea what could be the problem?

Thanks.

[dm]

I changed the IP-address of the management interface and everything works like before. I dont know what the problem was. Before I also testet diffrent browser and cleaned the browser cache, which had no effect.