Improve UX when loading new entries

I don't really know what happens behind the scenes, but if I haven't opened the app for a few days, I can basically see the bars in the page appear and grow, until they reach today (tapping the reload button every few seconds). I use a Redmi Note 8 Pro, so performance-wise it should be at least average.
The import process should either be sped up by an order of magnitude, done in the background, or be accompanied by some indicator that the displayed data isn't complete yet, e.g. a progress bar IMHO.