Adding to Marc's point, you might need to optimize caching. Check [1] for more details.[1] Optimizing the Dispatcher cache Optimizing AEM Site Caches

Which nodes under /libs did you overlay for the wizard?

This is proivded OOTB by brandportal. You can read more at [1]NOTE: Brandportal requires a different license than AEM.[1] Apply image presets or dynamic renditions

Are you talking about the limit in tag picker columns?

Can you go to http://<host>:<port>/system/console/bundles and restart the following bundles:org.apache.sling.commons.logserviceorg.apache.sling.commons.logcom.adobe.granite.loggingcom.adobe.granite.requests.logginglog4j.over.slf4j

Thanks for Sharing Theo!

Have you tried to cache these files on dispatcher or CDN?

I would recommend taking a thread/Heap dump and check the process that is failing. Based on that add you can look into adding additional CPU/Memory.[1] Take thread dumps from a JVM

Are you using AEM Forms or Sites?

Are you using SAML handler to configure authentication? Can you provide more details on the setup?