Phone slower after upgrade to V81

[avayax]

An issue I found on all of my T23G phones after upgrading to V81 (44.81.0.20).
The phone is reacting slower when pressing digits.
E.g. when the phone is idle and I press digits to dial a number, it takes a few seconds for the phone to react, for the dialed digits to appear on the phone and hearing the beep tone of each.
On V80 this wasn't the case.
Looks like V81 is slowing down my phones.
Sometimes there are also no beeps when pressing digits.