SAP Fiori Launchpad OnPremise not caching static resources

Hello everyone,

I've developed a couple of tiles and deployed them onto my S/4 HANA SAP Fiori Launchpad.

The thing is that the first time (after a refresh) I try and access the application it takes long time. That's because resources are not cached. Next time I click on the tile it's fast but if I refresh the page it's still slow.

Why are resources like ChartWrapper.js not cached? I can see in Google Developer Tools that they're being downloaded from the network.

CacheBuster is enabled (well it's actually FLP service in SICF) and background job is scheduled.

Regards

Marco