KNIME 3.3.2 on Mac Sierra Not Responding frequently (thread dump attached)

Hi all,

I recently changed a laptop from an older version of macbook to the latest one (hardware upgrade). I redownloaded KNIME 3.3.2, as version as I used on the old macbook. But every other minute my KNIME freezes and activity monitor shows it uses ~100% of my CPU. I allocated 4G of memory to knime.ini file. My sierra version is 10.12.6 and KNIME version 3.3.2

Attached is the  tread dump file.


Also attached the crash file. This starts to happen to my dbvisualizer as well.