Hi,
To me, noisy means that the system is working with hard disk drive, so:
1- You may find it helpful to increase the amount of ram that KNIME can use:
-Xmx6144m (=6 GB, considering your system resources. At least the half of your system RAM is recommended but I think you can increase it if you are not running any other application simultaneously)
2- You can increase the small table size (number of cells retained in memory):
-Dorg.knime.container.cellsinmemory=10000000
You can read more here and here.
Best,
Armin