Move more things to service work for performance reasons

[thibaultmol]

I don't know how the current code works, but I have a feeling (with the amount of times the main thread just straight up hangs) that a lot of work is still being done on the main thread, that could be done on the service worker. So that the main thread can focus on the actual ux being smooth.

The fact I get ui hangs.... on a Ryzen 7 7840U on performance mode.... is not normal. (i'm on the parking theme. not the bus or personal theme)

[pietervdvn]

I know, but using the service worker is somewhat complicated...

[thibaultmol]

I know, I understand. But I figured it'd make this issue just as a todo item for doing it eventually. It's going to be a big performance improvement I think.

Also maybe there are things in libraries you're already using that make using services workers for this stuff easier, i don't know