I think I broke it somewhere, I restarted the server. Even after restarting, I can't manage to run that graph. Seems to be quite big.
(minor note, I'm using the inbuild python webserver which is not recommended to be run in production, just for development, performance won't be amazing to say the least, I plan to switch that to an actual webserver)
edit: restarted the webserver to be clear.
Sim 4770 got 142889 points to be drawn on a graph. Didn't think I had to limit the amount of points drawn for a sim graph. :|