OldGuy has written on 2/15/2014 10:15 PM:

I tried Thunderbird and it is very slow.

Not for me.

Thunderbird programmers do not seem to know how to code to release for
user actions. It locks itself up until it finishes what it wants to
do.

Example?

Not good programming. I cannot seem to stop what is happening or do
other simple tasks until TBird finishes.

Your computer locks up until TB finishes? Which version of Windows?
Which version of TB?