Solved

Using the mobile app with tablet icons motion is jumpy

Using the mobile app with Samsung S3 tablet the icons move in regular jumps like a clock ticking. It is playable but annoying. While spectating the icons move smoothly. Using the Chrome browser with this tablet results in a blurry track and undersized UI with no option to resize in the settings menu. Low quality and very low quality were the same.

That is the correct tablet. But using the Chrome browser the UI was too small while the track was about the same size as in the app. Spectating today I noticed smoother icon motion when fewer cars were on the track.

Today's race the app was still running the icons jumpy but the Chrome browser ran smoothly and the track was sharper with quality settings on high. The ui was still blurry and smaller than I wanted with no adjustments available in settings.

Yes. The same as in the video.