Some users are experiencing performance issues with PhonePad Version 4.21 due to the new message list that was introduced in this version, particularly with Remote Mode connections. If you have not yet upgraded to 4.21, we recommend holding off until we have resolved this issue.
If you already have 4.21 installed and are experiencing these issues, you can downgrade to 4.20 by downloading the PhonePad executable and overwriting your 4.21 copy of PhonePad. There is no need to reinstall PhonePad.
You can download the PhonePad 4.20 executable using this link.
We apologize for any inconvenience. We are working on this issue and will release an update as soon as we have resolved it.
UPDATE
We have pulled the Version 4.21 release until we resolve this issue. The latest release version is now 4.20.