why session recording increases so large

Document ID : KB000104007
Last Modified Date : 03/07/2018
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Introduction:
Many files are large 2.7Gb, 17Gb, 23 Gb at External Storage. All these files haven’t *.inf file at External storage.
But user doesn’t see the session recording on PAM console. 
Question:
Why VNC access session recording increases so large?
Answer:
VNC session recording file size will be affected by graphical changes in session.

Customer checked and confirmed user was running task manager with constant change of graph which cause file size increase. 

Enhancement request has been created by customer to improve VNC session recording file size. 
https://communities.ca.com/ideas/235740193-session-recording-file-size-system-monitor-of-redhat-is-very-large