Memory display color
I think I would recommend changing the memory display bar background color and thresholds. This is the new memory display below the renderview.
With regards to the background, it is currently quite bright and distracting. Please change the background color to match the background of the progress bar - i.e., a gray rather than a white. The green is OK, leave as is.
After a bit of experimenting, what I believed was happening is happening with memory. ParaView is grabbing memory for calculations and output arrays, doing calculations, then releasing calculation memory. Thus, what the memory inspector is showing is correct after processing, but a huge undercount when any processing and/or rendering is occurring.
The way I tested was on RedHat Linux. Run ParaView. Sources/ Fast Uniform Grid. Only create the Distance Squared scalars. In a terminal, start running "free -h". Either have it run every second, or keep up-arrowing. What we care about is the last entry, "available". You may want to open the memory inspector, but this isn't necessary as we can see the memory footprint on the new memory display bar. Start increasing the size of the fast uniform grid. With 64 GBytes of memory, mine was OK at about -1000 to 1000, -1000 to 1000, -400 to 400. Memory showed about 65% full. Changing the Z to -400 to 450 crashed, but as I was only increasing about 8%, it shouldn't have. Note that free gave me a low of about 9 GBytes of free memory, but a final of about 20GBytes.
Please change the thresholds for the memory display bar to go yellow at 50% memory used, and red at 60% memory used.