CumulativeProtocolDecoder doDecode performance problem

To reproduce get the mina_test_2.0.zip from DIRMINA-609.

It seems to be working even worse with the current trunk version, it takes ~5 seconds between messages and then times out after the first message, if wait is increased to 10 seconds, it times out after the second message:

time = 03:49:36.320
remaining = 1024
limit = 1024
capacity = 2048
time = 03:49:41.619
remaining = 2048
limit = 2048
capacity = 2097156

java.lang.AssertionError: No message received

The issue differs from DIRMINA-609 as it affects not only large messages, but any message that doesn't fit into buffer (when doDecode returns false) and also all the subsequent messages (when doDecode returns true).
It's a serious issue making CumulativeProtocolDecoder completely useless.