Fix at times broken reactiveness

[Giszmo]

Especially at startup, Dexie DB hooks appear to not fire, sometimes for up to 20s at a time.

The event writer reports to usually take 100ms to write 500 events and takes 100ms pauses between single-threaded writing but something is happening on that thread that makes those 100ms writes take up to 20s during which all nostroid reactivity breaks down.

My suspicion is that something CPU-intensive kicks in that slows down everything or some other DB reading/writing affects the event writer. Could it be the Garbage Collector? I certainly produce a lot of garbage all the time everywhere. This needs to be debugged. Where is the biggest potential to avoiding garbage?