SPA: possible memory leak, requests are kept in memory

Report:

Currently when using the @bloomreach/spa-sdk in a server side rendering setup the spa-sdk package will keep all requests in node.js memory. This causes significant performance and memory issues.

Reproduction steps included.

Steps to reproduce :
Check out the @bloomreach/spa-sdk package: https://code.onehippo.org/cms-community/bloomreach-spa-sdk/tree/bloomreach-spa-sdk-14.1.0/examples/react-ssr
Run the react-ssr example with the node --inspact flag.
Monitor performance with something like chrome://inspect/#devices and create load on localhost:3000.
Trace the memory usage while doing requests and notice the spa-sdk package keeps all page requests in memory.