Hornetdrive App needs (on mobile devices) a long time to start. How can I accelerate this?

This can be remedied by increasing the cache. You can find this option in the client under "Settings" (gear wheel in the upper left corner) and the menu item "Cache". Particularly on mobile devices, system resources reach their limits with intensive use.

In this case, deactivating unneeded drives or combining individual drives into one larger drive helps as much as possible.