TinyDB slower than "normal Variables"

Is it slower to save Data in TinyDB than in “normal” variables.

For example: I get any data from a Bluetooth device and save it to variables, then I transform the data and show it in several labels. Also, I could get the data from a Bluetooth device and save it to a TinyDB, then transform and show it in a label.
Does it make a difence?

Probably, given there is a write and read to and from the device, instead of writing and reading in RAM, but you possibly will not notice any difference.

Okay, I understand. Could it be harmful for the smartphones "harddrive" to write and read several times in a second or doesn't that matter?

Never had a problem. Most modern phones will be using SSD type storage these days....

okay, thx