We receive reports that under heavy operation (e.g. multiple Sync jobs) or uploading multiple files using Rclone back-end the UI slows-down or grinds to a halt.

It happens on macOS, but also Windows. We've received also iOS report, it seems it works fine on Android.

This task is to find the root cause (likely some thread/scheduling issue on the layer of our rendering thread and Golang) and fix that.