T55A Teams very slow, unresponsive

[craig.itdd]

Hi, we have 55A Teams version phones, always kept up to date with firmware & Teams App.

We are finding the phones are very slow, eg from home screen:

Click 'calls' takes 5-6 seconds.

Then click 'recent' takes 10 seconds, to list recent calls!

Click home take 1-2 seconds.

Click People takes 2-3 seconds.

Is this typical for this model?

Are these phones not up to running the Teams software, ie are they too underpowered to run the current Teams software?