Here is the config of provided resource for each user: https://github.com/jupyterhub/mybinder.org-deploy/blob/57eb5777ade9a684a832a33b22e61bbfb5dbc574/config/prod.yaml#L51
To conclude, you are on (gke.)mybinder.org limited to using 1 CPU core on average every 100ms.
So while you can run something in parallell, the net use of CPU per 100ms on average needs to be max 1CPU, so it probably doesnt make sense given those restrictions.